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1、The use of“It”,it 用作形式主语,指代从句1）It is+adj.+that从句 It is clear(obvious，true，possible certain.)that.“清楚（显然，真的，肯定）”.It is important(necessary，right，strange，natural.)that.从句中要用虚拟语气（should+动词原形）2）.It is+v-ed+that 从句 It is said(reported，learned.)that.It is suggested(ordered/demanded/insisted/commanded.)tha
2、t.从句要用虚拟语气（should+动词原形）3）.It is a pity(a shame.)that.that后的从句一般用虚拟语气（should+动词原形）4).It is time(about time，high time)that.该句型中that 后的从句应该用虚拟语气 It is the first(second.)time that 5).It happens(seems，looks，appears)that.,2.作形式主语替代不定式 1).It takes sb.to do sth.“做要花费某人”2).It is kind(of sb.)to do sth.3).It i
3、s necessary(for sb.)to do sth.常见的形容词有：important，necessary，natural easy，safe，common，normal，hard，difficult,dangerous 3.作形式主语替代ing形式 It is no good(use)doing sth4.It 作形式宾语.We think it important to learn a foreign language.,二、特殊句型It is+被强调部分+that.2.It is.since.3.It is.when.“当的时候，是”4.It is.before.5.It looks(seems)as if.6.It doesnt matter whether(if).7.make it 及时赶到;成功;办成 8.catch it 被责骂;受处罚9.It的一些习惯用法How is it with your study?学习好吗？Thats it.这就对了。It went hard with him.他身遇不幸。It is all over with me.我完蛋了。We must fight it out.我们必须坚持到底。I cant help it.我没有办法。,Good bye,
