高中英語it作形式主語的句型匯總

1、“it”句型匯總1. It is + 被強調(diào)部分 + that . 該句型是強調(diào)句型。將被強調(diào)的部分放在前面，其它部分置于that之后。被強調(diào)部分可以是主語，賓語，表語或狀語。強調(diào)的主語如果是人，that可以由who換用。如果把這種句型結(jié)構(gòu)劃掉后，應(yīng)該是一個完整無缺的句子。這也是判斷強調(diào)句型與其它從句的方法。 It was they that (who ) cleaned the classroom yesterday. It was in the street that I met her father. 2. It is not until + 被強調(diào)部分 + that .該句型也是強調(diào)句

2、型。主要用于強凋時間狀語，譯成漢語”直到才”，可以說是 not . until . 的強調(diào)形式。 It was not until she took off her dark glasses that I realized she was a famous film star.= Not until she took off her dark glasses did I realize she was a famous film star.（倒裝結(jié)構(gòu)）= I didnt realize she was a famous film star until she took off her dark

3、 glasses. 3. It is clear ( obvious, true, possible, certain.) that .該句型中it 是形式主語，真正的主語是that 引導(dǎo)的主語從句，常譯為”清楚（顯然，真的，肯定）”是主語從句最常見的一種結(jié)構(gòu)。 It is very clear that hes round and tall like a tree. = That hes round and tall like a tree is very clear. 4. It is important ( necessary, right, strange, natural.) tha

4、t .該句型和上一個同屬一個句型。由于主句中的形容詞不同，that 后的從句中要用虛擬語氣（should + 動詞原形），should 可以省去。建議記住該句型中的形容詞。It is important that we (should) learn English well. It is necessary that he (should) remember these words. 5. It is said (reported, learned.) that .該句型中的it 仍是形式主語，真正主語是that 引導(dǎo)的主語從句。該結(jié)構(gòu)常譯為”據(jù)說（據(jù)報道，據(jù)悉）”。 It is said t

5、hat he has come to Beijing. It is reported that another earth satellite has been put into orbit.6. It is suggested ( ordered . ) that .該句型和上一個同屬一個句型。主句中的過去分詞是表示請求，建議，命令等詞時，that后的從句要用虛擬語氣（should + 動詞原形），should 可以省。常譯為”據(jù)建議；有命令）It is suggested that the meeting ( should ) be put off. It was ordered that

6、 we ( should ) arrive there in two hours. 7. It is a pity ( a shame . ) that .該句型中，that后的從句一般用虛擬語氣（should + 動詞原形），should可省去表示出乎意料，常譯為”竟然”。沒有這種意義時，則不用虛擬語氣。 It is a pity that such a thing ( should ) happen in your class.這種事竟然發(fā)生在你們班上，真是遺憾！ It is a pity that he is ill. 他生病了，真遺憾！ 8. It is time ( about ti

7、me ,high time ) that .該句型中that 后的從句應(yīng)該用虛擬語氣，值得注意的是 常用過去時態(tài)表示虛擬 有時也用should + 動詞原形，should 不能省。常譯為”是（正是）的時侯”。It is time that children should go to bed. = It is time that children went to bed. 9. It is the first ( second . ) time that .該句型要和上一個句型區(qū)別開來。該句型中的 that 從句不用虛擬語氣，而用完成時態(tài)。至于用什么完成時態(tài)，由主句的謂語動詞的時態(tài)決定。如果是一

8、般現(xiàn)在時，后面從句用現(xiàn)在完成時態(tài)；如果是一般過去時，后面從句則用過去完成時態(tài)。該結(jié)構(gòu)中 that 可以省去；it有時用 this 替換常譯為”是某人第一、二、次做”。 It is the first time I have been here. It was the first time I had been here. 10. It is +時間段+ since .該句型主要用作處理瞬間動詞的完成時，又要和表示一段時間的時間狀語連用的問題。主句中是時間作表語，其時態(tài)是現(xiàn)在時或完成時，since 引導(dǎo)的從句通常是一般過去時態(tài)，而且是瞬間動詞。如果主句是一般過去時，從句則用過去完成時。It is

9、 ( has been ) 5 years since his father died. 11. It is . when .該句型中的 when 引導(dǎo)的是一個時間狀語從句，主句中的 it 指時間，表語由具體的時間充當。常譯為”當?shù)臅r候，是”。 It was 5 oclock when he came here. 當他來的時候是5點。12. It be . before .該句型主句中的 it 指時間, 主句中的時態(tài)常是將來一般時，表示“要過才”，或用過去時表示“過了才”主句中的表語多是long, not long , 3 days , 2 weeks 等表示時間段的詞或短語。 It was

10、3 days before he went to Beijing. It will be not long before he finishes his job. 13. It happens (seems, looks, appears ) that.該句型中it是形式主語，that 引導(dǎo)的是主語從句，主句中的happen , seem等詞是不及物動詞 It happened ( so happened ) that he met his teacher in the street. 碰巧 It seems that he will be back in a few days. 看來 14.

11、 It takes sb. . to do sth.該句型中的不定式是真正的主語，it是形式主語，句型中的直接賓語是時間。常譯為”做要花費某人”。 It took thousands of people many years to build the Great Wall. 15. It is no good (use ) doing sth.該句型中的真正主語是動名詞短語，主句中的表語可以是no good , ( not any good ) , no use , ( not any use )。 It is no good learning English without speaking

12、 English. 16. It doesnt matter whether ( if ) .該句型中whether(if) 引導(dǎo)的從句是真正主語，該句型常譯為”不論（是否）沒關(guān)系。 It doesnt matter if they are old. 17. It is kind ( of sb. ) to do sth.該句型中的不定式短語是真正主語，如果不定式的邏輯主語是由 of引起，主句中的形容詞必須是能表示邏輯主語特征的形容詞。常見的有： bad , brave , careless, clever , cruel , foolish , good （好心的）, honest , ho

13、rrible , kind , lazy , modest , naughty , nice（有教養(yǎng)的）, polite, rude , silly , stupid , wise , wrong（錯誤的）等。 這個句型可以改寫為：sb. is kind to do sth. It is kind of you to say so. = You are kind to say so. 18. It is necessary ( for sb. ) to do sth.該句型與上一個同屬一個句型。如果不定式的邏輯主語是由for引起，主句中的形容詞通常是表示重要性，緊迫性，頻繁程度，難易，安全等情

14、況的形容詞。常見的形容詞有： important, necessary, natural easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。 在中的形容詞作表語可以用從句改寫， 如： It is important for her to come to the party. = It is important that she (should ) come to the party19. It looks ( seems ) as if .該

15、句型中it無意義。 as if 引導(dǎo)一個狀語從句。常譯為，”看起來好象”如果與事實不相符合，則用虛擬語氣 It looks as if he is ill.（真的病了） It looks as if he were ill. （沒有生病） It seemed as if he were dying. 20. We think it important to learn a foreign language.該句型中的it 作形式賓語。為了記憶方便我們可稱該句型為"6123結(jié)構(gòu)"。6指主句中常用的動詞：think, believe, make, find, consider, feel；1指的是形式賓語it； 2指的是賓補的兩種形式：形容詞或名詞；3指的是真正賓語的三種形式：