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　　⑤先行词既有人又有物，用which和who都不适合，这时宜用that. 如：

　　1.The writer and his novel that you have just talked about is really well known 。

　　2.The rider and his bike that had run over an old woman were held up by the police.

　　⑥被修饰词为数词时。

　　1.Yesterday I caught two fish and put them in a basin of water .Now you can see the two that are still alive 。

　　⑦如果有两个从句，其中一个关系代词已用which ，另一个关系代词宜用that，以避免语言的单调或重复。

　　Edison built up a factory which produced things that had never been seen before.

　　⑧疑问词是who或which，关系代词宜用that，以避免重复。

　　1. Which is the book that you like best？

　　2. Who is the man that is standing at the gate？

　　⑨主句是There be 结构，修饰其主句的定语从句宜用that 作关系代词。 如：

　　1. There is still a seat in the corner that is still free.

　　⑩被修饰成分为表语时，或者关系代词本身是定语从句的表语时，该关系代词宜用that 。

　　1. That‘s a good book that will help you a lot.

　　2. My home village is no longer the place （ that ） it used to be .