你好!
1.
在定语从句中,who和whom指人。
2.
在从句中作主语时,用who,其含义、人称、和数与先行词一致。
The man who was here yesterday is a middle school teacher.
3.
whom 在从句中作宾语,常可省略,在口语中可以用who代替whom.
The man (whom) you saw in my room yesterday is my mother.
4.
介词之后不能用who,只能用whom。
The young man to whom you talked is a famous athlete.
=The young man (whom ,who)you talked to is a famous athlete.
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