定语从句（介词+which/whom)
概念引入
This is the reason for which(=why) he left the company.
这就是他离开公司的原因。
Can you tell me for whom you are working?
你能告诉我你现在为谁工作吗?
There are sixty students in our class， all of whom are working hard.
班上有60 名学生，他们都在努力学习。
Recently I bought an ancient Chinese vase， the price of which was very reasonable. 最近我买了一个中国古代花瓶，价格非常合理。
语法讲解
【高清课堂：定语从句—定语从句关联词】，
“ 介词+关系代词”引导的定语从句
1). 介词放在关系代词前，关系代词只能用which或whom,关系代词不能省略。
这是莎士比亚出生的房子吗？
Is this the house in which Shakespeare was born?
在黑暗的街道上，没有任何人能让她求助。
In the dark street, there wasn’t a single person to whom she could turn for help.
2). 在限定性定语从句中，当介词位于定语从句末尾时，可用that/which(物), that/whom/who（指人）作介词的宾语，且关系代词可以省略。
This is the hero that/who/whom we are proud of.
