摘要：限定性定语从句和非限定性定语从句: ①限定性定语从句是句中不可缺少的组成部分.主句和从句之间不用逗号分开.引导非限定性定语从句的关系代词有who,whom,whose,which,of which等.这些关系代词都不能省略, ②非限定性定语从句是对主句先行词的补充说明.没有这种从句不影响主句意思的完整.一般用逗号把主句和从句分开.关系代词用which.不用that,指人时可用who.例如: I have two sisters,who are both students. Crusoe’s dog,which was now very old,became ill and died.

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