如果先行词是all

：(1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如：

All the people that are present burst into tears.

(2) 如果先等词被形容词最高级以及first, last, any, only, few, mush, no, some, very等词修饰，关系代词常用that,不用which, who，或whom。例如：

Tiananmen was the first place (that) we visited.

(3) 非限制性定语从句中，不能用关系代词that,作宾语用的关系代词也不能省略。例如：

There are about seven million people taking part in the election, most of whom、are well educated.

(4) which还有一种特殊用法，它可以引导从句修饰前面的整个主句，代替主句所表示的整体概念或部分概念。在这种从句中，which可以作主语，也可以作宾语或表语，多数情况下意思是与and this 相似，并可以指人。例如：

He succeeded in the competition, which made his parents very happy.

(5) 当先行词既有人又有物时,关系代词用that, 不用which.

He asked about the factories and workers that he had visited.

（6）当先行词有形容词最高级修饰时,关系代词用that, 而不用which.

This is the best novel that I have ever read. Guilin is one of the most beautiful cities that I have ever vis ited