it做形式主语的19个句型

该句型是强调句型.被强调部分可所以主语,宾语,表语或状语.强调的主语假如是人,that 可以由 who 换用.假如把这种句型构造划失落后,应当是一个完全无缺的句子.这也是断定强调句型与其它从句的办法.

2. It is not until + 被强调部分 + that ...

该句型也是强调句型.重要用于强凋时光状语,译成汉语“直

到……才……”,可以说是 not ... until ... 的强调情势.

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 realize she was a famous film star until she took off her dark glasses. 3.

It

is

clear

/obvious/true/possible/certain… that …

该句型中it 是情势主语,真正的主语是 that 引诱的主语从句,常译为“清晰（显然,真的,确定……）”是主语从句最罕有的一种构造.

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. 4.

It

is

important

/necessary/

right/strange/natural... that ...+(should) do

该句型和上一个同属一个句型.因为主句中的形容词不合,that 后的从句中要用虚拟语气（

should

+

动

词

本

相）,should 可以省去.

5. It is said (reported, learned…) that …

该句型中的it 仍是情势主语,真正主语是 that 引诱的主语从句.该构造常译为“ 据说（据报导,据悉……）”. 6.

It

is

suggested ( ordered, required ... ) that ... +(should) do

该句型和上一个同属一个句型.主句中的曩昔分词是暗示要求,建议,敕令等词时,that 后的从句要用虚拟语气（should + 动词本相）,should 可以省.常译为“ 据建议;有敕令……）”.

7. It is a pity ( a shame ... ) that ...

该句型中,that 后的从句一般

用虚拟语气（should + 动词本相）,should 可省去．暗示出乎料想,常译为“竟然”.没有这种意义时,则不必虚拟语气.

It is a pity that such a thing ( should ) happen in your class.这种事竟然产生在你们班上,真是！ It is a pity that he is ill. 他生病了,真！

8. It is time ( about

time , high time ) that ... 该句型中that 后的从句应当用虚拟语气,值得留意的是① 经常应用曩昔时态暗示虚拟．② 有时也用should + 动词本相,should 不克不及省.常译为“是（恰是）……的时侯……”.

9. It

is

the

first

( second … ) time that …

该句型要和上一个句型差别开来.该句型中的 that 从句不必虚拟语气,而用完成时态.至于用什么完成时态,由主句的谓语动词的时态决议.假如是一般如今时,后面从句用如今完成时态;假如是一般曩昔时,后面从

句则用曩昔完成时态.该构造中 that 可以省去;it 有时用 this 调换,常译为“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 ... 该句型重要用作处理刹时动词的完成时,又要和暗示一段时光的时光状语连用的问题.主句中是时光作表语,当时态是如今时或完成时,since 引诱的从句平日是一般曩昔时态,并且是刹

时动词.假如主句是一般曩昔时,从句则用曩昔完成时. 11. It is ... when ... 该句型中的 when 引诱的是一个时光状语从句,主句中的 it 指时光,表语由具体的时光充当.常译为“当……的时刻,

是……”.

12. It be ... before ... 该句型主句中的 it 指时光, 主句中的时态常是未来一

般时或曩昔时两种时态．主句中的表语多是long, not long , 3 days , 2 weeks 等暗示时光段的词或短语.常译为“……之后……”.

13. It happens (seems, looks, appears ) that... 该句型中it是情势主语,that 引诱的是主语从句,主句中的happen, seem 等词是不及物动词．

It happened ( so 译为“不管（是否）…… 没紧

happened ) that he met his 要……. teacher in the street. 恰

17. It is kind ( of sb. )

巧…… It seems that he to do sth.

will be back in a few days. 该句型中的不定式短看来……

14. It takes sb. … to do sth.

该句型中的不定式是真正的主语,it是情势主语,句型中的直接宾语是时光.常译为“做……要消费或人……”.

15. It is no good (use ) doing sth.

该句型中的真正主语是动名词短语,主句中的表语可所以

no good , ( not any good ) , no use , ( not any use ).

16.

It

doesn't

matter whether ( if ) ...

该句型中whether (if) 引诱的从句是真正主语,该句型常

语是真正主语,假如不定式的逻

辑主语是由 of 引起,主句中的形容词必须是能暗示逻辑主语特点的形容词.罕有的有: bad, brave, careless, clever, cruel, foolish, good (恶意的), honest, horrible, kind,

lazy, modest, naughty, nice (有教化的), polite, rude, silly, stupid, wise, wrong (错误的)等. 这个句型可以改

写为：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.

该句型与上一个同属一个句型.假如不定式的逻辑主语是由for 引起,主句中的形容词平日是暗示重要性,紧急性,频仍程度,难易,安然等情形的形容词.罕有的形容词有： ① important, necessary, natural

② easy, safe, common, normal, hard, difficult, dangerous, unusual, rare, impossible, pleasant 等. 在①中的形容词作表语可以用从句改写,如：

if 引诱一个状语从句.常译为,“看起来仿佛…… ＂假如与事实不相相符,则用虚拟语气．

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 ...

该句型中it 无意义. as