不定代词后定语从句的引导词（不定代词在条件状语从句中的用法）

先行词为 all , much, everything, nothing, something, anything, nothing, none, the one等不定代词时后面的定语从句的引导词只能用that。例如:

1. Please say all that you know.

请说出所有你知道的事情。

2. Is there anything that I can do for you? 有什么我可以为你做的吗？