It用法 (2).ppt
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1、1、it的基本用法的基本用法(1)用作人称代词,代替前文提到过的事)用作人称代词,代替前文提到过的事物。物。The train has arrived. It arrived half an hour ago.(2)用以代替提示代词)用以代替提示代词this, that。Whats this? Its a knife.Whose watch is that? Its mine.(3)起指示代词的作用,指一个人或事物。)起指示代词的作用,指一个人或事物。Who is knocking at the door? Its me.(4)指环境情况等。)指环境情况等。It was very noisy
2、(quiet) at the very moment.(5)指时间、季节等。)指时间、季节等。What time is it? Its eight oclock.It often rains in summer here.(6)指距离。)指距离。It is a long way to the school.(7)作形式主语,代替动词不定式、动名词或从句作形式主语,代替动词不定式、动名词或从句It is not easy to finish the work in two days.It is no use crying over spilt milk.It is as pity that yo
3、u didnt read the book.(8)作形式宾语,)作形式宾语,代替动词不定式、动名词或从句代替动词不定式、动名词或从句I think it no use arguing with him.I found it very interesting to study English.He made it clear that he was not interested in that subject.(9)用于强调句型。)用于强调句型。It was Xiaoming whom(that)I met in the street last night.It was in the stree
4、t that I met Xiaoming last night.It was I who met Xiaoming in the street last night.2、含有、含有“It is ”的句型的句型(1)It is time (for sb.) to do sth.It is (high) time that sb. did sth.(虚拟语气虚拟语气)(2)It is + 形容词(形容词(+of / for sb.)+ to do sth.通常用通常用 of的词有的词有brave、clever、careful、hopeless、kind、good、naughty、nice、sil
5、ly、stupid、foolish、wise等。等。(3)It is + 形容词形容词 + that + sb. + (should) do sth.(虚拟语气)(虚拟语气)能用于这个句型的形容词有能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去等。有时可省去should而直接用动而直接用动词原形。词原形。 It is important that we should
6、pay close attention to grain.It is natural that he(should)say so.(4)It is no use/ good + doing sth.It is no use trying again = It is of no use to try again.(5)It is + 被强调部分被强调部分 + that/who + Was it in the street that you met her?Who was it that called him“comrade”?It was not until yesterday that I m
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