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it做形式主语结构 的易错点篇一：常用it作形式主语的句型结构
常用it作形式主语的句型结构
◇ It + be +形容词+ that-从句
可用于此句型的形容词有: wonderful, true，good，right，wrong，（un）important，useless，surprising，clear，unusual，lucky，certain, necessary等。 如：
① It is quite certain that he will be at the meeting.
② It is surprising that he came late to school this morning.
③ It is important that we (should) study hard
注意: 该句型中的形容词是（un）important, necessary等时，从句应为 (should )+动词原形。 ◇ It + be + -ed 分词+ that-从句
适用该句型的过去分词主要有: said, reported, announced, hoped, thought，told，believed，expected，decided，suggested, known等。如：
① It is hoped that one day they will have enough animals to set them free
② It is well known that the earth goes around the sun.
③ It is suggested that the sports meeting (should ) be put off until next week.
注意: 该句型的过去分词是suggested时，从句应为 (should )+动词原形。
◇ It + be +名词+ that-从句
适用该句型的名词（词组）有: a pity，an honor，a good thing，a fact，a surprise，good news, one’s duty等。 如：
① It is a pity (that) you missed the sports meeting last week.
② It is a fact that English is being accepted as an international language.
◇ It ＋seem／ appear／ happen的适当形式＋that从句。该句型常可以转换成含不定式的简单句。如：
① It seems that there is a big waste pipe coming down from the town.
→There seems to be a big waste pipe coming down from the town.
② He appeared to becalm, but inside his heart was beating wildly with fear.
→It appeared that he was calm, but inside his heart was beating wildly with fear.
◇ It doesn't matter ( It’s no wonder; It doesn’t make much difference等)
＋ when/ where/ which/ whether 等从句。 如：
① Does it matter if he can't finish the job on time?
② They are all classmates. It is no wonder
they should help each other with their studies.
◇ It + be + adj./ n. (for sb. / of sb.) + to do sth. 该句型中的形容词通常是表示事物的特点或特征的如difficult，hard，easy，impossible，necessary，important等，此时用for；或表示人的性格特征或特点的如nice，good，bad，kind，silly，foolish，wise，clever， careless，rude，brave，cruel，careful， grateful等，这时要用 of。如：
① It is foolish of you to give up such a good chance.
② It is necessary for college students to master at least a foreign language
It作形式主语常见句型
动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：
1. It + be + 形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：
It’s a pity that you missed the exciting football match. It remains a question whether he will come or not.
3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如： It is reported that 16 people were killed in the earthquake. It is not decided who will give the operation to the patient.
4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如：
It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be + 形容词 + for sb.）+ 动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如： It’s necessary for the young to master two foreign language. It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6. It + be + 形容词 + of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如：
It’s very kind of you to help me with the work.
=You are kind to help me.
It seemed selfish of him not to share his dictionary with others. =He seemed selfish not to share his dictionary with others.
7. It + be +名词词组 + 动词不定式，如：
It is not a good habit to stay up too late.
8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：
It’s a waste of time talking to her any more.
It is no use arguing about the matter with him.
9. It + take ( sb. )+ 时间（金钱）+ 动词不定式，如：
It took the workers almost three years to finish building the dam. It will take a whole day to get to the top of the mountain on foot. 实战演练：
1. It is generally considered unwise to give a child he or she wants. (NMET 1997)
A. however B. whatever C. whichever D. whenever 2. In fact is a hard job for the police to keep order in an important football match. (2001 上海)
A. this B. that C. there D. it 3. is a fact that English is being accepted as an international language. (NMET1995)
A. There B. This C. That D. It 4. Is necessary to take off our shoes when we enter the lab? (MET88)
A. everyone B. this C. her D. it
5. ________ will take you a lot of time to find him in the crowd.
A. It B. I C. We D. They
6. It is no use his _________ there, the situation is hopeless now.
A. to go B. to be going C. going D. having gone
7. It is never too late to learn, ________?
A. is it B. isn’t it C. does it D. doesn’t it
8. ___________ is known to all that Shenzhou VI Launched Successfully.
A. As B. What C. It D. That
9. _______ is reported in the newspaper, the Earthquake in east China's Jiangxi Province killed 13 people
A. It B. As C. That D. What
10. ___________ certain that his invention will make people’s life convenient.
A. That’s B. This is C. It’s D. What’s
11. _________ that there is another football match on the air this evening.
A. It says B. It was said C. It is said D. What was said
12. __________ that their daughter got an opportunity to study abroad.
A. It’s a exciting news B. This is an exciting news
C. This is exiting news D. It’s exciting news
参考答案：
1——5 BDDDA 6——10CACAC 11——12CD
一、主语从句的概念与类型
主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.例如:
That she was chosen made us very happy.她当选了使我们很高兴.
What caused the accident is a complete mystery.是什么导致了这次事故还完全是一个谜. Whether she will come or not is still a question.她是否来还是一个问题.
Which team will win the match is still unknown.哪个队会赢得这场比赛还不知道.
Whoever comes to the party will receive a present.参加聚会的每一个人都将收到一份礼物. When they will start has not been decided yet.他们何时出发还没决定.
注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免"头重脚轻",常用it作形式主语,而把从句放在后面.例如:
It is a pity that she has made such a mistake.她犯了这样一个错误,真是遗憾.
It depends on the climate whether they are going shopping today.他们是否今天去购物还得看天气情况.
这样就构成了下面一些常用句型:
1)It is + adj. / n. +从句
It is a pity/shame that...遗憾的是……
It is possible that...很可能……
It is unlikely that...不可能……
2)It +不及物动词+从句
It seems/appears that...似乎……
It happened that...碰巧……
3)It + be +过去分词+从句
It is said that...据说……
it做形式主语结构 的易错点篇二：it做形式主语用法大全含练习及答案
It作形式主语常见句型
动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：
1. It + be + 形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：
It’s a pity that you missed the exciting football match.
It remains a question whether he will come or not.
3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如：
It is reported that 16 people were killed in the earthquake.
It is not decided who will give the operation to the patient.
4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如：
It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be + 形容词 + for sb.）+ 动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：
It’s necessary for the young to master two foreign language.
It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6. It + be + 形容词 + of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如：
It’s very kind of you to help me with the work.
=You are kind to help me.
It seemed selfish of him not to share his dictionary with others.
=He seemed selfish not to share his dictionary with others.
7. It + be +名词词组 + 动词不定式，如：
It is not a good habit to stay up too late.
8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：
It’s a waste of time talking to her any more.
It is no use arguing about the matter with him.
9. It + take ( sb. )+ 时间（金钱）+ 动词不定式，如：
It took the workers almost three years to finish building the dam.
It will take a whole day to get to the top of the mountain on foot.
实战演练：
1. It is generally considered unwise to give a child he or she wants. (NMET 1997)
A. however B. whatever C. whichever D. whenever
2. In fact is a hard job for the police to keep order in an important football match. (2001 上海)
A. this B. that C. there D. it
3. is a fact that English is being accepted as an international language. (NMET1995)
A. There B. This C. That D. It
4. Is necessary to take off our shoes when we enter the lab? (MET88)
A. everyone B. this C. her D. it
5. ________ will take you a lot of time to find him in the crowd.
A. It B. I C. We D. They
6. It is no use his _________ there, the situation is hopeless now.
A. to go B. to be going C. going D. having gone
7. It is never too late to learn, ________?
A. is it B. isn’t it C. does it D. doesn’t it
8. ___________ is known to all that Shenzhou VI Launched Successfully.
A. As B. What C. It D. That
9. _______ is reported in the newspaper, the Earthquake in east China's Jiangxi Province killed 13 people
A. It B. As C. That D. What
10. ___________ certain that his invention will make people’s life convenient.
A. That’s B. This is C. It’s D. What’s
11. _________ that there is another football match on the air this evening.
A. It says B. It was said C. It is said D. What was said
12. __________ that their daughter got an opportunity to study abroad.
A. It’s a exciting news B. This is an exciting news
C. This is exiting news D. It’s exciting news
参考答案：
1——5 BDDDA 6——10CACAC 11——12CD
㈠ it作形式主语：
it作形式主语时没有具体的意义，而只是帮助把真正的主语移到句子后部去，使句子显得平稳一些。it作形式主语时，可以代替三种形式：不定式、动名词和主语从句。 ⒈ it代替不定式短语
常用于下列句型中：It + be +形容词 + (for/of sb.) to do sth.
It + be + 名词 + to do sth.
It takes sb. some time to do sth. 干…花了某人…时间
It’s up to sb. to do sth. 干…是某人的职责或义务
①It is everyone’s duty to obey the law.
遵守法律是每个人的义务。（ it作形式主语, 代替不定式短语to obey the law） ②It is difficult for a foreigner to learn Chinese.
对于一个外国人来说，学习汉语是困难的。
（ it作形式主语, 代替不定式短语to learn Chinese）
③It is not right to use these places as rubbish dumps.
把这些地方用来倒垃圾是不对的。
（it作形式主语, 代替不定式短语to use these places as rubbish dumps）
④It took them a year to build the bridge.
建这座桥花了他们一年的时间。（ it作形式主语, 代替不定式短语to build the bridge） ◆ It be + 形容词+ for sb. to do sth.与It be + 形容词+of sb. to do sth.：
如果句型中的形容词描述的是sb.的品质、品格，在逻辑上可以作sb.的表语，则sb.前应用介词of，否则就用for。
①It’s necessary for us to use a short-wave radio to pick up the programmes.
我们用一台短波收音机收听这些节目是必要的。
③It’s kind of you to help me.
感谢你对我的帮助。（= You are kind to help me. ）
④It was foolish of him to give up the job.
他放弃那工作是愚蠢的。（= He was foolish to give up the job
⒉ it代替动名词短语：
动名词作主语用后置形式的情况远不及不定式那么普遍，常限于no good, no use, useless, waste等词的后面。
①It is no good/ use having a car if you can’t drive.
如果你不会开车，有车也没用。( it作形式主语,代替动名词短语having a car) ②It is a waste of time watching TV.
看电视是浪费时间。（ it作形式主语,代替动名词短语watching TV）
③It is no use asking him.
问他没有用。（ it作形式主语,代替动名词短语asking him）
⒊ it代替主语从句：
这个主语从句可以用连词that引导，也可以用连接代词或连接副词引导。
①It was clear that they had no desire for peace.
很清楚他们没有和平的诚意。
（ it作形式主语,代替主语从句that they had no desire for peace）
②It is doubtful whether she will be able to come.
她能否来还很难说。（ it作形式主语,代替主语从句whether she will be able to come） ③It was clear enough what she meant.
她的意思是够清楚的。（ it作形式主语,代替主语从句what she meant）
用it作形式主语，把真正的主语从句移至后面的常见句型有：
◆ It is a pity/ a shame/ a fact/ an honour/ good news/ no wonder/ a wonder… that… ①It was a pity that the engineer couldn’t come.
可惜工程师没能够来。
②It is a wonder that he continues to gamble when he always loses!
令人惊讶的是他一直输还一直赌。
◆ It is + 形容词（如： strange/ natural/ surprising/ obvious/ true/ fortunate/ wonderful/ funny/ possible/ impossible/ likely/ unlikely/ clear/ unusual/ certain/ important…）that … ①It is certain that he will win. 他一定会取胜。。
◆ It seems/ happened/ turned out/ suddenly struck me/ occurred to me…that …
①It happened that I wasn’t there that day. 恰好那天我不在那里。
◆ It + be + 过去分词（如：said/ reported/ announced/ decided/ expected/ hoped/ known/ believed…）that…
②It is said that nothing has been done about it.
据说至今对此没采取任何措施。
③It is reported that more than twenty people were killed in that bus accident.
据报道在那次的公共汽车事故中有二十多人丧生。
* 注意要在It is suggested/required/desired/ordered/proposed…that…的主语从句中用虚拟语气： (should) + 动词原形
①It is requested that he give a performance at the party.
有人请求他在聚会上表演一个节目。
②It is suggested that we should get everything ready by tonight.
建议一切在今晚准备好。
◆ It doesn’t matter +连接代词或副词…
It doesn’t make too much difference +连接代词或副词…
①It doesn’t matter whether he comes or not.
他来还是不来都没关系。
②It won’t make much difference whether you go today or tomorrow.
你今天去也好，明天去也好，关系不大。
㈡ it作形式宾语：
it作形式宾语时，可以代替三种形式：不定式、动名词和宾语从句。
it作形式宾语时，需具备两个条件：① 真正的宾语是不定式、动名词或从句 ② 有宾语补足语 具备了这两个条件，形式宾语it一定要用。
⒈ it代替不定式短语
think/ find/ feel/ consider/ make/ regard…+ it +形容词/名词 + 不定式短语
①I find it pleasant to work with him.
(it 作形式宾语，代替不定式短语to work with him)我觉得和他一起工作很愉快。 ②They felt it difficult to finish the work in such a short time.
（ it 作形式宾语，代替不定式短语to finish the work in such a short time）
他们认为在这么短的时间内完成这项工作是困难的。
⑥All these noises made it impossible for me to go on with the work.
（ it 作形式宾语，代替不定式短语to go on with the work）这些噪音使我无法继续工作。 ⒉ it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些) ①The professor considers it no good reading without understanding.
这位教授认为阅读而不理解没有益处。
③He found it useless( no use) arguing with him.
他发现和他辩论没有用。
④He thought it absolutely senseless attempting the impossible.
想做不可能的事情，他认为是完全没道理的。
⒊ it代替宾语从句：
①We all thought it a pity that the conference should have been cancelled.
会议取消了我们都感到很遗憾。
②I took it for granted that they were not coming. 我想他们准是不会来的了。 ③I’ll see to it that everything is ready in time.我负责使一切都按时准备好。
㈢ 含it 的常用句型
英语中有一些固定句型中含有it,应注意这些句型的使用。
⒈ It be + 被强调部分 + that/ who + 其他成分
I met Peter in Japan last year.
⑴ It was I who/that met Peter in Japan last year.
⑵ It was Peter whom/that I met in Japan last year.
⑶ It was in Japan that I met Peter last year.
⑷ It was last year that I met Peter in Japan.
* not …until 也可用于强调句型
例１ Mr Brown didn’t come back until eleven o’clock.
可变为：It was not until eleven o’clock that Mr Brown came back.
* 强调句也可变为特殊疑问句
例１ It was in 1949 that the PRC was founded.
可变为：When was it that the PRC was founded?
⒉ It’s + 地点状语+ that…（强调句） It’s +地点名词+ where… (定语从句) ①It is the town where I was born.
(the town 为地点名词，定语从句)这是我出生的镇子。
②It was in the town that I was born.
(in the town为地点状语，强调句型)我出生在这个镇子。
⒊ It’s + 时间名词+ when…(时间状语从句) It’s + 时间状语 +that…(强调句)
①It was at 8 o’clock that he returned. (at 8 o’clock是时间状语，强调句) 他是在八点钟回来的。
②It was 8 o’clock when he returned.(8 o’clock 是时间名词，时间状语从句)他回来的时候是八点钟。
⒋ if it is convenient to you 如果你方便的话
If it is convenient to you, you can start tomorrow.
如果方便的话，你明天可以动身。
⒌ believe it or not 信不信由你
①Believe it or not, I’ll go abroad next month.
不管你信还是不信，我下个月要出国。
⒍ It’s time that…did / should do …(定语从句)
①It is time that I went and picked up my daughter from school.我该去学校接我女儿放学了。
②It’s high time that we stopped/should stop this practice.我们的确该停止这种做法了。 ⒎ It is /has been…since…did…(时间状语从句)
It is just a week since we arrived here. 我们来这里已一星期了。
⒏It won’t be …before…用不了（多长时间）就会…
It wasn’t …before…没过（多长时间）就…
①It will be a long time before we finish the task.我们还需要很长时间才能完成这项任务。 ②It wasn’t long before he learned to use the computer.不久他就学会使用计算机了。 ㈣ 易混用其他句型
英语中有一些句型不含it, 但却易被误用了it，常见的有以下句型：
⒈ There is something/nothing wrong/ the matter with sb./ sth.
There is nothing wrong /the matter with him. He’s just pretending.
他没什么事，他只是在装呢。
⒉ There is no doubt about…对…毫不怀疑 There is no doubt that…对…毫不怀疑 ①There is no doubt about his suitability for the job毫无疑问，他适合这个工作。
it做形式主语结构 的易错点篇三：It作形式主语常见用法
It作形式主语常见句型
1.It + be +形容词+ that-从句
可用于此句型的形容词有: wonderful, true，good，right，wrong，（un）important，useless，surprising，disturbing,frightening,alarming,clear，unusual，lucky，certain, necessary等。 如： ① It is quite certain that he will be at the meeting.他将出席会议是无疑的。
② It is surprising that he came late to school this morning.他今天早上迟到真令人惊讶。 ③ It is important that we (should) study hard.我们努力学习是很重要的。
注意: 该句型中的形容词是（un）important, necessary等时，从句应为 (should )+动词原形。
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
2.It + be +名词+ that-从句
适用该句型的名词（词组）有: a pity，an honor，a good thing，a fact，a surprise，a question, a shame,a custom, a truth,our hope, no wonder, good/bad manners等。如：
① It is a pity (that) you missed the sports meeting last week. 你错过了上周的运动会太可惜了。
② It is a fact that English is being accepted as an international language. 事实上英语已经被作为一种国际语言而接受了。
3. It ＋seem／ appear／ happen的适当形式＋that从句。
① It seems that there is a big waste pipe coming down from the town.
②It appeared that he was calm, but inside his heart was beating wildly with fear.
4. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如：
It is reported that 16 people were killed in the earthquake.
It is not decided who will give the operation to the patient.
5. It is time ( about time ,high time ) that ...
该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟．② 有时也用should + 动词原形，should 不能省。常译为＂是（正是）．．．的时侯．．．＂。 It is time that children should go to bed.
= It is time that children went to bed.
6. It is the first ( second ... ) time that ...
用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中 that 可以省去；it有时用 this 替换．常译为＂是第一（二）．．．次．．．＂。
It is the first time I have been here.
= This is the first time I have been here.
7. It + be + adj./ n. (for sb. / of sb.) + to do sth. 该句型中的形容词通常是表示事物的特点或特征的如difficult，hard，easy，impossible，necessary，important等，此时用for；或表示人的性格特征或特点的如nice，good，bad，kind，silly，foolish，wise，clever， careless，rude，brave，cruel，careful， grateful等，这时要用 of。如：
① It is foolish of you to give up such a good chance.
② It is necessary for college students to master at least a foreign language.
it做形式主语结构 的易错点篇四：It做形式主语讲解
it做形式主语结构 的易错点篇五：It作形式主语常见句型
It作形式主语常见句型
四川省乐至中学 张与刚
动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：
1. It + be + 形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：
It’s a pity that you missed the exciting football match.
It remains a question whether he will come or not.
3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如：
It is reported that 16 people were killed in the earthquake.
It is not decided who will give the operation to the patient.
4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如：
It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be + 形容词 + for sb.）+ 动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：
It’s necessary for the young to master two foreign language.
It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6. It + be + 形容词 + of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如：
It’s very kind of you to help me with the work.
=You are kind to help me.
It seemed selfish of him not to share his dictionary with others.
=He seemed selfish not to share his dictionary with others.
7. It + be +名词词组 + 动词不定式，如：
It is not a good habit to stay up too late.
8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：
It’s a waste of time talking to her any more.
It is no use arguing about the matter with him.
9. It + take ( sb. )+ 时间（金钱）+ 动词不定式，如：
It took the workers almost three years to finish building the dam.
It will take a whole day to get to the top of the mountain on foot.
实战演练：
1. It is generally considered unwise to give a child he or she wants. (NMET 1997)
A. however B. whatever C. whichever D. whenever
2. In fact is a hard job for the police to keep order in an important football match.
(2001 上海)
A. this B. that C. there D. it
a fact that English is being accepted as an international language. (NMET1995)
A. There B. This C. That D. It
4. Is necessary to take off our shoes when we enter the lab? (MET88)
A. everyone B. this C. her D. it
5. ________ will take you a lot of time to find him in the crowd.
A. It B. I C. We D. They
6. It is no use his _________ there, the situation is hopeless now.
A. to go B. to be going C. going D. having gone
7. It is never too late to learn, ________?
A. is it B. isn’t it C. does it D. doesn’t it
8. ___________ is known to all that Shenzhou VI Launched Successfully.
A. As B. What C. It D. That
9. _______ is reported in the newspaper, the Earthquake in east China's Jiangxi Province killed 13 people
A. It B. As C. That D. What
10. ___________ certain that his invention will make people’s life convenient.
A. That’s B. This is C. It’s D. What’s
11. _________ that there is another football match on the air this evening.
A. It says B. It was said C. It is said D. What was said
12. __________ that their daughter got an opportunity to study abroad.
A. It’s a exciting news B. This is an exciting news
C. This is exiting news D. It’s exciting news
参考答案：
1——5 BDDDA 6——10CACAC 11——12CD
it做形式主语结构 的易错点篇六：it作形式主语常见句式
it作形式主语常见句式 动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：
1. It + be + 形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：
It’s a pity that you missed the exciting football match. It remains a question whether he will come or not.
3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如： It is reported that 16 people were killed in the earthquake. It is not decided who will give the operation to the patient.
4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如：
It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be + 形容词 + for sb.）+ 动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：
It’s necessary for the young to master two foreign language. It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6. It + be + 形容词 + of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如：
It’s very kind of you to help me with the work.
=You are kind to help me. It seemed selfish of him not to share his dictionary with others. =He seemed selfish not to share his dictionary with others.
7. It + be +名词词组 + 动词不定式，如：
It is not a good habit to stay up too late.
8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如： It’s a waste of time talking to her any more. It is no use arguing about the matter with him.
9. It + take ( sb. )+ 时间（金钱）+ 动词不定式，如：
It took the workers almost three years to finish building the dam.
It will take a whole day to get to the top of the mountain on foot.
实战演练： 1. It is generally considered unwise to give a child he or she wants. (NMET 1997)
A. however B. whatever C. whichever D. whenever
2. In fact is a hard job for the police to keep order in an important football match. (2001 上海)
A. this B. that C. there D. it
3. is a fact that English is being accepted as an international language. (NMET1995)
A. There B. This C. That D. It
4. Is necessary to take off our shoes when we enter the lab? (MET88)
A. everyone B. this C. her D. it 5. ________ will take you a lot of time to find him in the crowd.
A. It B. I C. We D. They
6. It is no use his _________ there, the situation is hopeless now. A. to go B. to be going C. going D. having gone
7. It is never too late to learn, ________?
A. is it B. isn’t it C. does it D. doesn’t it
8. ___________ is known to all that Shenzhou VI Launched Successfully.
A. As B. What C. It D. That
9. _______ is reported in the newspaper, the Earthquake in east China's JiangxiProvince killed 13 people
A. It B. As C. That D. What
10. ___________ certain that his invention will make people’s life convenient.
A. That’s B. This is C. It’s D. What’s
11. _________ that there is another football match on the air this evening. A. It says B. It was said C. It is said D. What was said 12. __________ that their daughter got an opportunity to study abroad.
A. It’s a exciting news B. This is an exciting news
C. This is exiting news D. It’s exciting news
参考答案：
1——5 BDDDA 6——10CACAC 11——12CD
it做形式主语结构 的易错点篇七：it 做形式主语练习
It 句子 翻译
限时 20分钟 Name：
翻译下列句子：
对于我来说学习英语是很容易的。
It is difficult for me to drink so much water in one hour.
对于那个聪明的男孩来说游泳是很困难.
It is easy for us to join the football team.
对于我们来说在海里游泳是危险的。
It is difficult for Lulu to cook some delicious food.
对于那个女老师来说教我们是快乐的。
It is easy for him to go different companies.
对于那个胖孩子来说骑车是困难的。
It is not useful for Mary to do the maths homework.
对于那个矮男孩来说加入篮球队是勇敢的。
It is useful for Peter to study English well.
对于那个老人来说爬树是危险的。
It is very important（重要）to keep our environment(环境) clean and tidy.
对于那个笨男孩来说找到答案是很困难的。
It is impossible（不可能的）for the girl to go shopping after school。
it做形式主语结构 的易错点篇八：it做形式主语
形式主语是动词不定式的一种,它也是逻辑主语, 可以把它归类到逻辑主语的第一种(不定式的逻辑主语) 用作宾语的不定式，用作目的状语，用作结果状语的不定式都是属于不定式的大概念里面的.
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详细用法
形式主语it
作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替
的是句子的逻辑主语，概括起来会有如下情况：
1. 句子的逻辑主语为不定式
如：It is very kind of you to give me a hand in time.
It is my pleasure to address the meeting.
It was pretty hard for him to bring up the child on his own.
2. 句子的逻辑主语为从句
如：It so happened that the tickets were sold out.
It is extremely obvious that she has been lying about her identity. It suddenly occurred to me that the message must have been hidden between the layers of the briefcase.
3. 句子的逻辑主语为动名词短语
这类句子远不如前面两种出现率高，主要在（no good, waste, useless, no use,
dangerous）等词语的后面用
如：It is no use reasoning with him.
It is no good reading in dim light.
作形式主语的代词只能用it ，不能用that，this等词。例如:
1) It is easier to lose friends than to make friends. 交朋友难而失去朋友比较容易。
2) It is important for modern young people to master at least two foreign languages. 掌握至少两门外语对于当代年轻人来说是很重要的。
以上两句中的it是形式主语，真正的主语是后面的不定式短语。
3) It is considered no good reciting without understanding. 不理解的背诵被认为是没有好处的。
4) It is no use crying over spilt milk. 覆水难收。
以上两句中的it是形式主语，真正的主语是V-ing形式。
5) It is a fact that English is being accepted as an international language.英语作为一门国际语言正日益为人们所接受，这是不争的事实。(NMET,95)
6) It depends on the weather whether we will go. 我们去不去得看天气行事。(其中的whether 不能换成if,因为if不能引导主语从句。)
以上两句中真正的主语是名词性从句。
[]
it 作形式主语主要用于下列三种情况
I. 不定式作真正主语
主要用于下列句型：
1. It + is/was + /n. (形容词或名词) +to do sth.
A. 名词作表语。主要有a pity, a pleasure, an idea等。 例如：
In fact________is a hard job for the police to keep order in an important football match. ( 2001上海高考题)
A. this B. that
C. there D. it (答案为D)
再如： It is a great pleasure to do this. 这样做多好啊。
It is a good idea to think this way. 这样考虑问题是个好办法。
除be外，其他动词也有跟名词的情况。例如：
It seems a pity to waste the food. 浪费这些食物真可惜。
It requires efforts to master a foreign language. 掌握一门外语需要种种努力。
B. 形容词或形容词短语作表语。 分两种情况：
1) 下列形容词： kind, good, nice, clever, wrong, right ,foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。例如： It was foolish of you to leave school.你中途退学，真是傻瓜。
It was brave of her to speak out in public. 她能当众大声讲话，真勇敢。 这种of sb. to do sth. 句型，of 的宾语可以作句子的主语。上面两个句子可以改写为：
You were foolish to leave school.
She was brave to speak out in public.
2) 其他形容词作表语，常见的形容词有：necessary, hard， important, difficult, easy, possible，common等。例如：
It is necessary to use a short-wave radio to pick up the programmes. 必须用短波收音机才能收到节目。
如果要说明不定式表示的动作是谁做的，可以在不定式前加for ＋ 名词或代词 ＋ to do sth.(for 后的宾语不能作句子的主语)。名词或代词作不定式的逻辑主语，
即表示不定式所指动作的执行者。在此句型中，形容词只对不定式行为者作某种描述，而不涉及其品行。例如：
It is not hard for one to do a bit of good. 对于一个人来说做点好事并不难。
It,s common for leaves to fall from the trees in the fall. 秋天树叶从树上落下是件常事。
需要注意的是：动词不定式作主语，一般情况下用it作形式主语，而把动词不定式(从句)放在后面。也可以直接用不定式作主语。例如：
It is wrong to tell lies. ＝ To tell lies is wrong. 撒谎是不对的。
但在疑问句和感叹句中，只能用it作形式主语。 例如：
Isn't it a good idea to have a walk around? 出去兜一圈难道不是一个好主意吗？
What a pleasure it is to work with you! 同你一起工作是多么愉快啊！
2. It + v. + to do sth.
动词不定式作主语时除动词be以外，动词take, cost， need, require, make, sound, occur 等也可用it作形式主语，而把动词不定式放在后面。例如：
It took us three years to complete the project. 我们花费三年时间才完成了这项工程。
It sounds reasonable to do it this way.听起来这样做有道理。
It needed hard work to finish the job. 要完成这项工作需要努力地工作。 It didn,t occur to me to ask him to help me. 我根本没想到要找他帮忙。 II. 动名词作真正主语
用于这种形式的是一些特定的形容词和名词。例如：
It was nice meeting you. 见到你真高兴! (分别时用)
它与不定式作真正主语的区别在于，动名词说到的动作已经发生。 例如: It is nice to meet you. (刚刚见面时用)
it 作形式主语，动名词作真正主语主要用于下列句型：
It's ＋n.(名词或名词短语)/adj.(形容词)＋ doing sth.
1)下列形容词后常用动名词作真正主语：nice, good, useless, hard, foolish, enjoyable, worthwhile等。例如：
It is nice talking to you. 跟你交谈真是愉快。
It's foolish behaving like that. 这样的表现是很愚蠢的。
It is useless doing that. 那样做没用。
2)下列名词或名词短语作表语时常用动名词作真正主语：use, good, fun, a waste of, job, task等。例如：
It's a waste of time doing this. 这样做是浪费时间的。
It's no good (use) doing that. 那样做没好处(没用)。
It's an awful job doing this. 做这事真是一件可怕的差事。
It's fun doing this. 做这事真有趣。
It is not an easy task doing this work. 做这工作真非易事。
III. 名词从句作真正主语
用it 作形式主语的结构主要用于下列句型：
It +谓语+名词从句(主语从句、表语从句、同位语从句)
1. It is ＋名词＋从句: 这样的名词有a fact, a surprise, an honor(非常荣幸),a pity, common knowledge(常识)等。例如：
It is common knowledge that the full moon brings fair weather. 皓月兆天晴,这是常识。
It is a surprise that you gave such an answer to the question. 你对这个问题作了这样的回答，令人吃惊。
2. It is ＋形容词＋从句 : 这样的形容词有natural, true, strange, necessary, important, obvious(很明显), certain, wonderful, funny, possible, likely, probable等。例如：
It is certain that free medical care will be given to most people in our city. 我们城市的多数人将享受免费医疗，这是一定的。
It is probable that he has known everything. 很可能他什么都已经知道了。
3. It ＋动词＋从句: 这样的动词有seem,happen, appear, look, matter, make, strike, occur(突然想起)等。
It appeared that he had a taste for music. 看来他对音乐有一定的鉴赏力。
It made us very happy that she was saved.她能化险为夷令我们大家很高兴。
4. It ＋ be + 分词＋从句: 这样的分词有 said(据说)， reported(据报道),believed(人们相信)，known(众所周知)，decided(已决定)，proved(已证实), thought, expected, annouced, arranged, amusing, puzzling, striking等。例如：
It is said that Li Hao has been to Europe.据说李郝去过欧洲。
It was amusing that a rabbit ran out of the empty box on the desk.桌上的空盒子里竟然跑出来一只兔子,太有趣了。
需要说明的是，大部分连接词引导的主语从句都可以用 it充当形式主语。例如：
It remains unknown when they are going to get married. 他们何时结婚依然不明。
It says in the newspaper that the enemy has been defeated. 报纸上报导敌人被打败了。
it做形式主语结构 的易错点篇九：语法易错点归纳
一、定语从句
引导定语从句的关系代词有that,which,who（宾格whom），所有格whose）和关系副词 where when why 等，关系代词或关系副词在定语从句中充当一个成分，关系代词that，which,who,whom等在从句中分别作主语或宾语，whose在从句中作定语，而关系副词when,where,why等在从句中作状语。
如：
①I will never forget the days when/in which we worked
together.
②I will never forget the days which/that we spent together. 解析：在句①中，表示时间的名词the days在从句中充当的是状语，所以用关系副词when来代指，引导定语从句修饰先行词the days；而在句②中，表示时间的名词the days在从句中充当的是动词spent的宾语，所以用关系代词that或which来代
指。
同样，表示地点或原因的名词如果在从句中作状语，则用关系副词where 或why来代指；如果在从句中作动词的宾语，则用
which或that来代替。
如：
①This is the factory where/in which I worked.（作状语）
②This is the factory that/which I visited years ago.（作宾
语）
注：当先行词为time,reason, place时，引导词可以省略。如： ①This was the first (when/what) I had serious trouble with
my boss.
②That is the reason (why) I did it.
③This is the place (where) we met yesterday.
另外，定语从句中谓语动词的数应与先行词的数相一致。如： ①Mr. Jackson is the only foreigner that is present at the
party.0
②He is one of the students who were praised by the
teacher.
解析：在句①中，先行词foreigner被only修饰，强调只有一个，所以从句中谓语动词用单数形式，而在句②中，who引导的定语从句修饰先行词the students，为复数，所以从句谓语
动词应为复数。
感悟：学生之所以在这一点上经常出错，主要是对定语从句的理解不够深刻，分辨不出主句和从句，对句子成分的把握也不到位，搞不清关系代词或关系副词在从句中充当何种句子成分。所以要做好这一类题，要首先弄清关系代词和关系副词的用法，而
且应善于分辨和分析句子结构及其相应成分，这样才能对症下
药，快速准确地找到瓿之所在
二 名词性从句中的易错点
（一）that引导的定语从句与同位语从句
定语从句与前面的的名词是修饰与被修饰的关系，“……的名词”，而同位语从句是用来说明前面名词的内容。与that从句同
位的名词必须是一些表示事实或概念的抽象名词，如
fact,news,belief,truth,reply等。That在定语从句中必须作成分，可用which或who/whom代替，而that在同位语从句中
不充当任何句子成分，只起连接作用。如：
①Along with the letter was his promise that he would visit me this coming Christmas. ②Do you still remember the
chicken farm that we visited three months ago.
解析：在句①中，that引导同位语从句解释说明promise的内容，that不充当任何句子成分，只起连接作用，而在句②中，that在其引导的定语从句中作动词visited的宾语，对先行词the
chicken farm起修饰作用。
感悟：学生之所以在这一点上容易出错，主要还是因为对定语从句的理解不够深刻，分辨不出that在从句中是否充当了句子成分，因此，还需在句子分析上下功夫，并且搞清何谓同位语从句。
（二）名词性从句中，关于it作形式主语和形式宾语的易错点
1) 名词性从句作主语或宾语时，为保持句子平衡，常用it作形
式主语或形式宾语。如：
It’s a pity that he don’t come to give a speech.（形式主语） We think it possible that you can finish the job today.（形
式宾语）
2）谓语动词 appreciate, dislike, hate, like, love, make等接由if或when 引导的宾语从句时往往在从句前加上形式宾语it.
例如：I would appreciate it if you could come to my
birthday party.
3）动词hare, take, hide, punish, put等,后接由that 引导的
病因从句式，往往在从句前加形式宾语it.
例如：① I take it that you will be leaving Shanghai soon. ② we punished it that we had finished the project ahead
of time.
4）短语动词answer for, count on depend on, insist on, see to等后接有that引导的宾语从句时，必须冠以形式宾语it.
例如：① I’m counting on it that you will come.
② She’ll see to it that he goes ahead.
注：作形式主语和形式宾语时只能用it.
三、代词it、one、that的用法与区别.
One泛指，指代前面提到的那类人或物，用于指代可数名词，相当于a+名词单数，其复数形式ones前一般要有定语，否则
就要用some.
That（those复数）即可指代不可数名词，表特指，相当于the+
名词，后面经常与介词修饰语连用。
It指代上文出现的名词，表示同类同物，另外还可表示时间、距离、天气、还可指代人称代词，表示性别身份不明，可作形式主语，形式宾语，引导强调句式以及一些固定搭配，如：get it, catch
it, make it.
例如：① I have lost my watch. I think I must buy one.我丢了只表，我想我必须再买一只。（代指上文指到的同类事物，但
不指同一个）
② Where is my pen? Have you seen it? 我的钢笔不知弄到
哪去了，你见了吗？（代指上文提到的同一事物）
③ The land of China is larger than that of America. ④ Tome has a red pen and a blue one （或two blue ones） ⑤ He has no child, and he wants toadopt one （或 some）
四、虚拟语气
it做形式主语结构 的易错点篇十：it做形式主语
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