定语从句中的介词+which形势，怎样确定介词用哪个

你可以先把介词放到从句中，然后看适合哪个，以下是我老师上定从时的课件 你可以参考下 注意notes部分呐~

介词＋关系代词
prep.+ which/whom
1.She showed me the book. She paid 5 dollars for the book.
She showed me the book which/that she paid 5 dollars for.
She showed me the book for which she paid 5 dollars.
2.The child is at the school gate. You talked about him.
The child (whom/who/that) you talked about is at the school gate.
The child about whom you talked is at the school gate.
3.This is the pen. I write the letter with it.
This is the pen (which/that) I write the letter with.
This is the pen with which I write the letter.
4.This is the man . I’m looking for him.
This is the man (whom/who/that) I’m looking for.
This is the man for whom I’m looking.
5.This was the place (which/that) I used to live in.
6. The library form which I often borrow books is not
far from here.
7. Is this the bus on whcih you left your umbrella?
8. October 1,1