It的20種用法全分析
It的20種用法全分析
以下是小編為大家整理的it 的用法總結(jié)，希望能幫助大家更好地認識it這個單詞，提高英語水平。
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 about 600 years ago that the first clock with a face and an hour hand was made.
It was they that (who ) cleaned the classroom yesterday.
It was in the street that I met her father.
2. 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 he’s round and tall like a tree.
= That he’s round and tall like a tree is very clear.
3. It is important ( necessary, right, strange, natural...) that ...
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.
4. It is not until + 被強調(diào)部分 + that ...
該句型也是強調(diào)句型。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.
= I didn’t realize she was a famous film star until she took off her dark glasses.
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 that 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 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 time ,high time ) that ...
該句型中that 后的從句應該用虛擬語氣，值得注意的是① 常用過去時態(tài)表示虛擬.② 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"是第一(二)...次..."。
It is the first time I have been here.
= This is the first time I have been here.
10. It is .... 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 ( has been ) 5 years since his father died.
11. It is ... when ...
該句型中的 when 引導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...的時候，是..."。
It was 5 o’clock when he came here.
12. It be ... before ...
該句型主句中的 it 指時間, 主句中的時態(tài)常是將來一般時或過去時兩種時態(tài).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。常譯為"...之后..."。
It was 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. 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 English.
16. It doesn’t matter whether ( if ) ...
該句型中whether(if) 引導的從句是真正主語，該句型常譯為 "不論(是否)...沒關(guān)系...。
It doesn’t 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 , horrible , 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，安全等情況的形容詞。常見的形容詞有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。
在①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 party
19. It looks ( seems ) as if ...
該句型中it無意義。 as if 引導一個狀語從句。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：不定式短語，動名詞短語或that引導的賓語從句。
We think it our duty to clean our classroom every day.
He felt it important learning English well.
They found it difficult that they would finish their work in two days.
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