- a) 在引导非限定性定语从句时。
(错)The tree, that is four hundred years old, is very famous here.
- b) 介词后不能用。
We depend on the land from which we get our food.
We depend on the land that/which we get our food from.
a)在there be 句型中，只用that，不用which。
b)在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c)先行词有the only, the very修饰时，只用that。
All that is needed is a supply of oil.
Finally, the thief handed everything that he had stolen to the police.