it做形式主語用法大全學(xué)習(xí)資料

1、 it做形式主語用法大 全I(xiàn)t作形式主語常見句型 動詞不定式，動名詞或主語從句作主語時，通常把它們放在謂語動詞前，而用it作形式主語，放到句首，常見句型有： 1. It + be + 形容詞+主語從句，如： It is uncertain whether he can come to Jennys birthday party or not. 2. It + be + 名詞詞組 + 主語從句，這類名詞有：a fact, a pity, a shame, an honour，a question等，如： Its a pity that you missed the exciting footba

2、ll match. It remains a question whether he will come or not. 3. It + be + 過去分詞 + 主語從句，這類過去分詞有：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

3、及物動詞(seem, appear, happen等) + 主語從句, 這類不及物動詞有：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 + 形容詞 + for sb.）+ 動詞不定式 這類句型常用形容詞easy, difficult, hard, important, possible，wise等作表語，有時候?yàn)榱藦?qiáng)調(diào)不定式動作的執(zhí)行者，常在不定式前加for sb，如： Its necessary fo

4、r the young to master two foreign language. It is unwise to give the children whatever they want. 這類形容詞有：easy, difficult, hard, important, possible，wise 6. It + be + 形容詞 + of sb. + 動詞不定式，這類形容詞常是表示心理品質(zhì),性格特征的形容詞，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和這些

5、形容詞可以構(gòu)成主系表結(jié)構(gòu)。如： s very kind of you to help me with the work. It=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 +名詞詞組 + 動詞不定式，如： It is not a good habit to stay up too late. 8. It + be +

6、名詞或形容詞 + 動名詞，這類名詞和形容詞常常是：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. )+ 時間（金錢）+ 動詞不定式，如： It took the workers almost three years to finish building the dam. It will take a who

7、le day to get to the top of the mountain on foot. 實(shí)戰(zhàn)演練： 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.

8、 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

9、 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. isnt it C. does it D. doesnt it 8. _ is known to all that Shenzhou VI Launched Successfully. It D. That C. A. As B. What 9. _ is

10、 reported in the newspaper,the Earthquake in east Chinas Jiangxi Province killed 13 people A. It B. As C. That D. What 10. _ certain that his invention will make peoples life convenient. A. Thats B. This is C. Its D. Whats 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 go