Section Ⅲ　Grammar--名词性从句(Ⅱ)与it作形式主语

语 境 自 主 领 悟 先观察原句 ①That is why English has so many difficult rules that confuse people.

②It is interesting to learn how the words for animals and meat developed.

③It is certain that this process will continue...

④I always wondered when I would get the English novel my parents had promised to give me.

⑤What I always dreamt of has come true.

⑥It is fun wandering in the countryside. 后自主感悟 1.第①、④、⑤句中的黑体部分都是名词性从句，它们分别在各自的句子中作表语、宾语和主语。

2.第②、③、⑥句中的黑体部分都是it作形式主语的用法，it分别替代的是动词不定式、主语从句和动名词短语。

　　一、连接代词、连接副词引导的名词性从句

　　1．由what，which，who/whom，whose等连接代词和when，where，why，how等连接副词引导的名词性从句在句子中可以充当主语、宾语、表语或同位语。

　　(1)主语从句

　　What surprised us was her ignorance.

　　使我们吃惊的是她的无知。

　　Where we will go hasn't been decided.

　　我们要去哪儿还没有定下来。

　　When she will come is still unknown.

她何时来还不知道。