it做形式主语用法大全含练习及问题详解Word格式文档下载.docx

1、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：Its 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.=H

2、e 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：Its a waste of time talking to her any more.It is no use arguing about the mat

3、ter 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. whic

4、hever D. whenever2. 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. it3. 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

5、we enter the lab? （MET88） A. everyone B. this C. her D. it5. _ will take you a lot of time to find him in the crowd. A. It B. I C. We D. They6. It is no use his _ there, the situation is hopeless now. A. to go B. to be going C. going D. having gone7. It is never too late to learn, _? A. is it B. isn

6、t it C. does it D. doesnt it8. _ 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 Chinas Jiangxi Province killed 13 people A. It B. As C. That D. What10. _ certain that his invention will make peoples life c

7、onvenient. A. Thats B. This is C. Its D. Whats11. _ 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 said12. _ that their daughter got an opportunity to study abroad. A. Its a exciting news B. This is an exciting news C. This is exitin

8、g news D. Its exciting news参考答案：15 BDDDA 610CACAC 1112CD 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。 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Its up to sb. to do sth. 干是某人的职责或义务I

9、t is everyones 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）It 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）It 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

10、 dumps）It 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。Its necessary for us to use a short-wave radio to pick up the programmes.我们用一台短波收

11、音机收听这些节目是必要的。Its kind of you to help me.感谢你对我的帮助。（= You are kind to help me. ）It 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 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。 It is no good/ use having a car if you cant drive.如果你不会开车

12、，有车也没用。（ it作形式主语,代替动名词短语having a car）It 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）It 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） 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。It 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

13、 no desire for peace）It 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）It 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 wo

14、nder thatIt was a pity that the engineer couldnt come.可惜工程师没能够来。It 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/ im

15、portant）that It is certain that he will win. 他一定会取胜。 It seems/ happened/ turned out/ suddenly struck me/ occurred to methat It happened that I wasnt 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）thatIt is said that nothing has been d

16、one about it.据说至今对此没采取任何措施。It 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/proposedthat的主语从句中用虚拟语气： （should） + 动词原形It 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。It is suggested

17、 that we should get everything ready by tonight.建议一切在今晚准备好。 It doesnt matter +连接代词或副词It doesnt make too much difference +连接代词或副词It doesnt matter whether he comes or not.他来还是不来都没关系。It wont make much difference whether you go today or tomorrow.你今天去也好，明天去也好，关系不大。 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。

18、it作形式宾语时，需具备两个条件： 真正的宾语是不定式、动名词或从句 有宾语补足语 具备了这两个条件，形式宾语it一定要用。think/ find/ feel/ consider/ make/ regard+ it +形容词/名词 + 不定式短语I 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。They 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

19、 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。All 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。 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）The professor considers it no good reading without understanding.这位教授认为阅读而不理解没有益处。He found it

20、 useless（ no use） arguing with him.他发现和他辩论没有用。He 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。 it代替宾语从句：We 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。I took it for granted that they were not coming.我想他们准是不会来的了。Ill see to it tha

21、t everything is ready in time.我负责使一切都按时准备好。 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。 It be + 被强调部分 + that/ who + 其他成分I met Peter in Japan last year. It was I who/that met Peter in Japan last year. It was Peter whom/that I met in Japan last year. It was in Japan that I met Peter last year. It was last ye

22、ar that I met Peter in Japan.* not until 也可用于强调句型例Mr Brown didnt come back until eleven oclock.可变为：It was not until eleven oclock thatMr Brown came back.* 强调句也可变为特殊疑问句例It was in 1949 that the PRC was founded.When was it that the PRC was founded? Its + 地点状语+ that（强调句） Its +地点名词+ where （定语从句）It is the

23、 town where I was born.（the town 为地点名词，定语从句）这是我出生的镇子。It 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。 Its + 时间名词+ when（时间状语从句）Its + 时间状语 +that（强调句）It was at 8 oclock that he returned.（at 8 oclock是时间状语，强调句）他是在八点钟回来的。It was 8 oclock when he returned.（8 oclock 是时间名词，时间状语从句）他回来的时候是八点钟

24、。 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。 believe it or not 信不信由你Believe it or not, Ill go abroad next month.不管你信还是不信，我下个月要出国。 Its time thatdid / should do （定语从句）It is time that I went and picked up my daughter from school.我该去学校接我女儿放学了。Its

25、 high time that we stopped/should stop this practice.我们的确该停止这种做法了。 It is /has beensincedid（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。It wont be before用不了（多长时间）就会It wasnt before没过（多长时间）就It 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。It wasnt long before he learned

26、to use the computer.不久他就学会使用计算机了。 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： There is something/nothing wrong/ the matter with sb./ sth.There is nothing wrong /the matter with him. Hes just pretending.他没什么事，他只是在装呢。 There is no doubt about对毫不怀疑 There is no doubt that对毫不怀疑There is no doubt about his suitability for the job毫无疑问，他适合这个工作。There is no doubt that he is hard to deal with.毫无置疑他很难对付。 There is no need （for sb.） to do sth. 没必要There was no need for him to remain in Paris.他没有必要继续留在巴黎。