第1个回答 2017-12-01
关系代词which和that两者指物时，常可通用。例如：
1）This is the black pen that /which he likes very much.
2）A bookshop is a shop that/which sells books。
关系代词that也可以指人（相当于who或whom），决不可改用（which只能指物）。
关系代词which和that指物时的比较
指物时两者常可通用，但下列情况不可以换用：
1. 先行词为all, few, little, many, much, something(anything, everything, nothing), one of等不定代词时，常只可用that。例如：1）That‘s all ( that ) I know.
2．先行词被all、any、few、little、many、much、no、only、just、very等修饰时，多用that。例如：The only thing ( that ) we can do is to wait.
3．先行词是序数词、adj.最高级时，或者先行词被序数词、adj.最高级修饰时，常只用that。例如：The first thing that we should do is to work out a plan.
4. 关系代词which作定语从句中介词的宾语时，有时介词可提到which之前。而关系代词that也可作定语从句介词的宾语，但介词却不可提到who，也就是说在介词后不可用关系代词that。例如：The room (which/that) she lives in is a large one. =The room in which(that×) she lives is a large one.
5. 先行词既有人又有物时，只可用that。例如：The writer and his book that you talked about is really well-known.
6．非限制性定语从句不可用that引导，只可用which（指人时，用who或whom）。例如：This is the best movie that I have seen. 这是我看过的最好的一部电影本回答被网友采纳