高三英语it的用法

用于由that 引导的主语从句，有下面几种类型：
it +be+形容词+that从句： eg: It is natural that they should have different views. it +be+名词+that从句: eg: It’s a shame that you’re sick. it +动词（+宾语）+that从句 eg: It happened that she wasn’t in that day. Eg2: It never occurred to me that perhaps she was lying. It+动词的被动语态(said/believed/thought/expected/reported/ known+that从句 eg: It’s said that there has been an earthquake in India.
பைடு நூலகம்
形式宾语it:
it 可以代表不定式： eg: She found it difficult to convince him. Eg2: He felt it his duty to take care of them. It 代表that引导的从句： eg: I took it for granted (that) you would be coming. It间或代表连接代（副）词引导的从句： Eg: He hasn’t made it clear when he is coming back. Eg2: They haven’t made it known where the meeting is to take place.
awarded to the same person. 10）It takes sb. Time to do… Eg: It took Mary 20 minutes to choose a suitable dress for the
party.
形式主语it
有下面几种类型： Be+形容词+不定式 eg: It’s better to be early. Be+名词+不定式 eg: It was his duty to take care of the orphans. Be+介词短语+不定式 eg: It’s beyond me to say why. It + 及物动词+宾语+不定式 eg: It makes me sick to think about it. Be+名词+动名词 eg:It’s no good standing here in the cold. Be + 形容词+动名词 eg:It’s helpless trying to advise her to do so . 其他结构+动名词 eg:It doesn’t matter waiting a few more days.
非人称代词it
It 用于代替指示代词， It 可以表示“是谁（在某处或做某事）” “Who’s that?” “It’s me.” It’s your mother on the phone. “Why, it’s you!” she cried. It还可以用来泛指某件事。 Isn’t it awful! It doesn’t matter. it 有时并不指具体东西，而指天气、时间、环境、距离 等，称为非人称代词it.It’s raining. It’s Tuesday today. It’s quiet here. It’s two miles to the beach.
用it起始的句型归纳：
1）it +be+形容词+从句： eg: It is not clear to me why he behaved like that. 2）it +be+名词+从句: eg: It’s a puzzle how life began. 3）it +动词（+宾语）+从句 eg: It doesn’t matter much where we live. eg2: It makes no difference whether we go by train or by boat. 4）it +动词的被动语态+从句 eg: It is not decided who will edit it.
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It is time that we gave the house a thorough cleaning.
9）It + be + the first/second time that…(谓语动词用完成时态） Eg: It is the first time in history that two Nobel Prizes have been
5）it +动词be +that从句 eg: No, it couldn’t be that they were interested in him. 6）It +be + 一点时间+ when… Eg: It was Christmas Eve when I got the news of his being killed in a car crash. 7）It +be+一段时间+ since… Eg: It is/has been three week since I last heard from him. 8）It is time to do/ that…(谓语用过去时态） Eg: It is time for us to give the house a thorough cleaning.