如何分辨定语从句中引导词的成分！！

1、先行词指人,在句中作主语who:
John,who is only five,has an inborn talent for music. (约翰是一外5岁大的孩子,有着天生的音乐才能。)
2、先行词指人,在句中作宾语whom:
His wife,whom you met at my home,was a teacher.
(他的妻子，就是你在我家遇见的那个，是一位老师。)
3、先行词指物,在句中作主语或宾语which:
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然耸立，它是一百多年前建造的。)
注意：无论先行词指人或者指物,在句中作主语或者作宾语，非限制性定语从句的引导词都不能用that。
4、先行词在句中作定语，无论指人或者指物,引导词都用whose:
The girl,whose name is Kate,is the top of the students in our school.(那个女孩是我们学校最优秀的学生，她的名字叫Kate。)
The book,whose cover is red,is mine.(封面是红色的那本书是我的。)
5、先行词指物，在句中作时间状语用when：
The sports meeting will be put off till next month,when we will have made all the preparations.(运动会将被推迟到下个月，那时我们做好一切准备。)
6、The next day we arrived in New York,where we were inerviewed on the radio.（第二天我们到达纽约，在那里我们接受了电台的采访。）
7、如果先行词作介词的宾语，先行词指人，介词提前的结构是：介词＋whom；先行词指物，介词提前的结构是：介词＋which:
President Wilson,with whom he had not the same