6.关系代词在限制性定语从句中常可以省略,一般有以下几种情况:

　　1) 关系代词在从句中作直接宾语时，在大多数情况下可以省略。
　　This is something (that) you must always keep in mind.
　　The man (whom) you just met is our manager.
　　关系代词作介词宾语时，介词位于句尾时关系代词可以省略;介词位于关系代词之前时则关系代词不能省略。
　　This is the room (which) Churchill was born in.
　　This is the room in which Churchill was born.(which不可省略)

　　2) 关系代词作主语时一般不能省略，但如果关系代词在由there … be存在句构成的定语从句中作主语时常可省略。
　　This is the only book (that) there is on this subject.
　　The old professor made full use of the time (that) there was left to him to continue his research.

　　3) 在way后面的定语从句中in which或that通常省略。
　　That’s the way (that/in which) I look at it.
　　I don’t like the way (that/in which) you laugh at her.