What从句的用法

Question

如题所述

Answer 1

1. 引导名词性从句：I don't understand what he is talking about.
(此句中what在名词性从句里做宾语）
It is difficult to decide what should be done first.
(此句中what在名词性从句里做主语）
2. 引导感叹句：I can't believe what a beautiful girl she is.

Answer 2

What 引导从句时，充当的成份不一样，可以做主语从句，宾语从句等。

引导名词性从句：I don't understand what he is talking about（做宾语的成份）.

2.It is difficult to decide what should be done first（做主语）.

供参考！

Answer 3

引导名词性从句：
主语从句：what i need is more money.
宾语从句：i don't believe what you said.
表语从句：he is no longer what he used to be.
同位语从句：i have no idea whay he will do next.