在定语从句中,如果从句中的谓语动词前面有名词或者代词作主语,那么先行词就是作定语从句的宾语;如果从句中的谓语动词前面没有有名词或者代词作主语,那么先行词就是作定语从句的主语语。
例句:
1.The book that/which I bought last week is very interesting.
that/which引导的从句是 I bought,I是从句的主语,所以先行词就是作宾语。
2.The man who/that said hello to you is Mary's father.
who/that指代先行词,在从句中作主语。


