定语从句中以下情况多用that.

(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. Is there anything that I can do for you?

(2) 如果先行词被the only, the very, the same, the last, the best等词修饰，关系代词常用that(指人时，可以用who),例如：

This is the very book that I want to find. That is the best film that we have seen.

I was the only person in my office that/who was invited.

(3) 当先行词被all, every, no, some, any, little, much所修饰时； You can take any seat that is free.

(4) 当先行词被序数词或形容词最高级所修饰时。 It is the first foreign book that I have ever seen. This is the most beautiful flower that I have seen.

(5) 在there be句型中，常用that.

There is a man that lives in that village.

(6) 先行词有两个，一个指人，一个指物，关系代词应该用that。例如： The boy and the dog that are in the picture are very lovely.