(4)由when,where,why引导的定语从句。例如:
I know the reason why he came late.
This is the place where we lived for 5 years.
I will never forget the day when I met Mr Liu.
注意:先行词是表示地点或时间时,有时用where或when,有时用that(which)引导定语从句。这时要根据从句的谓语动词是及物的还是不及物的。如果是及物的就用that(which),否则用where或when。例如:
This is the house where he lived last year.
This is the house that (which) he visited last year.
I thought of the happy days when I stayed in Beijing.
I have never forgotten the day which we spent together.
(5)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,没有这种从句并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.
