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it做形式主语用法大全.doc

1、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 Jennys 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:Its a pity that you missed the exciting football match.It

2、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, app

3、ear, happen 等) + 主语从句, 这类不及物动词有:appear, happen, seem 等, 如:It seemed that he didnt 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:Its necessary for the young t

4、o 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

5、: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.=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

6、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 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

7、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. 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

8、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. 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

9、_ 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. isnt 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 Earthqua

10、ke in east Chinas Jiangxi Province killed 13 peopleA. It B. As C. That D. What10. _ certain that his invention will make peoples life convenient.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 newsC. This is exiting news D. Its exciting news参考答案:15 BDDDA 610CACAC 1112CD

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