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it用来充当形式主语或形式宾语，后面的真正主语或真正宾语通常是不定式结构、动名词或名词性分句。It的这种用法叫作先行it。 eg. It is quite important for us to form a good studying habit. I think it important to finish the task in time. it用来充当形式主语，后置的真正主语往往可以取代先行it的位置，出现在句首。 Eg. To form a good studying habit is quite important for us 并非所有先行it结构都可转化，下边句子只能作如下转化。 eg. It seems that John is not coming after all. John doesnt seem to be coming after all. Cleft it : Task 1. 句子的基本结构 2 .分裂句的本质 3 . 分裂句的结构 4 .假拟分裂句 句子结构 主语+谓语 已知信息 新信息 末端中心 末端重心 Eg. I told him the news yesterday. 分裂句的本质 Eg. I told him the news yesterday. Eg. It is I that told him the news yesterday 分裂it | 
