Is this your dog?No, it isn't.
二、it作非人称代词
it有时并不指具体的东西,而泛指天气、时间、日期、距离、价值、度量、温度、环境等,称为非人称的it:
1. 指天气:
It is a lovely day, isn't it?
It is a bit windy.
2. 指时间:
It was nearly midnight when she came back.
3. 指环境:
It was very quiet in the café.
4. 指距离:
It is half an hour's walk to the city centre from my home.
5. 指日期:
What's the date today? It's May 1, 2007.
6. 指季节:
It is summer now.
7. 指度量:
It is about 5 kilograms.
8. 指价值:
----What's the cost of the T-shirt?
----It is 150 Yuan.
三、it用作形式主语
替代作主语的从句、动词不定式、动名词,而把真正作主语的从句、动词不定式、动名词置于句尾。
1. 代作主语的动词不定式,其句型为
(1)It be adj.(for sb.)to do sth.
此处adj. 通常为描述事件的形容词:easy,difficult,hard,necessary,unnecessary,possible,impossible,likely,unlikely,right,wrong,important,unimportant,legal,illegal,well-mannered,ill-mannered,polite,impolite,clear,obvious,certain,suitable,proper,fit,useful,useless,dangerous…
It is illegal(for a teenager)to drive a car without a license.
不错哦 (2)It be adj. of sb. to do sth.
此处adj. 通常为描述人的形容词:kind,unkind,nice,rude,cruel,considerate,thoughtful,thoughtless,careful,careless,silly,foolish,stupid,clever,wise,crazy.
It's kind of you to help me with the problem.
(3)It替代作主语的动名词的常见句型
It's no good/use doing…
It's(well)worth doing…
It's(well)worth one's while doing/to do…
It's(well)worth while doing/ to do
It's no use crying over spilt milk.
2.作形式主语替代主语从句
1. It is clear ( obvious,true,possible,certain....) that.....
该句型中it 是形式主语,真正的主语是that 引导的主语从句,常译为"清楚(显然,真的,肯定...)" 是主语从句最常见的一种结构。例如:
It is very clear that he's round and tall like a tree.
It is strange that it hasn't been noticed before.真奇怪,它以前没有引起注意。
2. It is v-ed that…=sb/sth is to do
It is said (reported/ learned/believed/thought/known/told/hoped.....) that...
该句型中的it 仍是形式主语,真正主语是that 引导的主语从句;该结构常译为"据说(据报道,据悉...)"。
It is said that he has come to Beijing.
It is reported that another earth satellite has been put into orbit.
③ It is + noun +从句
It is a pity (a shame /an honor /a good thing/a fact /a surprise/...) that...
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