如果先行词在从句中做主语，用who指代它；如果先行词在从句中做宾语，用who或whom指代它；如果先行词在从句中做介词宾语，可以用介词+whom指代它；如果先行词做从句中名词的定语，可以whose指代它。
The boy who is running ahead of others is from Class 3.
跑在最前面的那个男孩是三班的。
She spoke to the man who works in the bank.
她和在银行工作的人谈过了。
She's the girl who/whom I told you about.
她就是我跟你说过的那个女孩。
Do you know the young man who/whom Mary is talking to?
你认识和玛丽谈话的那个年轻人吗？
These new neighbours, to whom I was introduced yesterday, have come here from Singapore.
我昨天经人介绍认识这些新邻居是从新加坡来的。
He is a man for whom I have the greatest admiration.
他是我极为钦佩的一个人。
She was a famous model whose looks were her riches.
她是一位著名的模特，容貌是她的财富。
