The man who was driving a red car is my brother.
He was the one who did all the talking.
I am surrounded by the people who I like.
The student whom/who you scolded was very upset.
The family whom/who I met at the bus station were very kind.
The student (whom/who) you scolded was very upset.
The family (whom/who) I met at the bus station were very kind.
I am surrounded by the people (whom/who) I like.
The boy (who/whom) I spoke to is a nice person. （whom作介词to的宾语）
The boy whom I spoke to is a nice person.
= The boy to whom I spoke is a nice person. （whom不可省）
The retailer whom I purchased my laptop from is an old man.
= The retailer from whom I purchased my laptop is an old man.
5. who则不可紧接介词， 因此介词不可提前至who前
The boy who I spoke to is a nice person. （√）
The boy to who I spoke is a nice person. （×）
Amy, who was my roommate, is married.
She was introduced to the author, whom she was excited to meet.
David, who/whom I am working for, is a foreigner.
This woman, whom he had lived with for two years, had never known him.
= This woman, with whom he had lived for two years, had never known him.
David, who I am working for, is a foreigner. （√）
David, for who I am working, is a foreigner. （×）