Практикум по грамматике английского языка : учебное пособие

WHICH and WHO(M) + prepositions
• in defining relative clauses
That’s the town in which he was born.
The people with whom I stayed were very kind.
NOTE:
In everyday speech, the preposition is put at the end of the clause and the 
relative pronoun which, who, that are usually left out. 
That’s the town he was born in. 
The people I stayed with were very kind.
• in non-defining relative clause (formal style)
She’s studying chemistry, about which I know very little.
Mr and Mrs Johnson, with whom we went on holiday, live in Bristol.

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NOTE:
In everyday speech, it is more usual to put the preposition at the end of 
the clause and to use who instead of whom
She’s studying chemistry, which I know very little about.
Mr and Mrs Johnson, who we went on holiday with, live in Bristol.
Exercise 25. Join each pair of sentences without using who, whom, or 
which.
Example: The restaurant was in South Street. We went to it. 
The restaurant we went to was in West Street.
The woman is a good friend of my mother’s. I borrowed the money from her.
The woman I borrowed the money from is a good friend of my mother’s.
1. The man is Jack’s cousin. I introduced you to him.
2. The hotel overlooked the sea. We stayed at it.
3. The shop is closed. I bought the trousers from it.
4. The people like him very much. He works with them.
5. The school was experimental. I went to it.
6. The lecture was informative and rather interesting. We listened to it.
7. The job was challenging and well-paid. I applied for it.
8. The woman is a qualified football referee. He got acquainted with her.
9. The student is a tennis champion. I study with him.
10. The girl is my close friend. Pete is engaged to her.