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It 的特殊用法
1)强调结构 It is + 主 语 (从句 )/ 宾 语 (从句 )/ 状语 (名词 / 介词短语 / 从 句)+ that / who / whom… 特别要注意 (特殊) 问句和宾语从句中的强调结构 ①(Who /What) was it that + 谓语 + 其他 ?
②(Wh-- ) was it that + 主语 + 谓语 + 其他 ?回答:Yes, it was; No, it was not; (What…is that…也是强调结构) 2)形式主语 代替
1、不定式 ① It is + 形容词/名词 + (for sb.) to do sth.; (表示做某事怎样用for,形容词有:easy / difficult / right / wrong / important / necessary /essential / a (n) pleasure / pity / honor )
② It is + 形容词 + of sb. to do sth (表示主语特征时用 of; 形容词有:赞成good, nice, kind, clever, brave,
bold, honest, polite, careful;责备wrong, bad, rude, cruel, careless, naughty, silly, foolish, stupid)
③ It takes / costs / requires + n.+(for sb.)to do sth.
= It takes sb. + n.+ to do sth.
2、动名词It is no use / good doing sth; It is not any use / good doing sth.. It is worthwhile doing sth. It isn't much fun doing sth; It is simply a waste of time doing sth;
3、主语从句 ① It is + 形容词 / 名词 / 现在分词 / 过去分词 + that:likely,clear, possible,obvious,necessary,important,
essential,advisable,strange, amazing,a pity,a fact,a wonder, a shame, an honor,no wonder,surprising,announced, believed, considered, expected,estimated,hoped,known,reported,rumored,said,supposed, thought,suggested, advised, demanded, ordered, requested, ② It seems /appears / happens /turned out / proved that…; ③ It occurs to sb./ It strikes sb. that… 3) 形式宾语 代替
1、 不定式 find / think / consider / regard / feel /make… + it + 形容词/名词 (做宾补) +(for sb.) to do; 2、 动名词find/think/consider/feel/make… + it + 形容词/名词+ doing; 3、 宾语从句 find/think/consider/feel/make… + it + 形容词/名词 + that… 4) 表时间
1、 It is + 一段时间 + since + ① 瞬间动词的过去时: …已经多久了;② 延续性动词的过去时:指该状态结束以来已有多久了
2、 It was + 时间点 + when + 动词的过去时:已经是…
3、 It will be / won’t be + 一段时间 + before + 动词的一般现在时: 要过多久…/过了不久
It was/wasn’t + 一段时间 + before + 动词的过去时:要过多久…/ 过了没多久
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