用who,whom或which把以下每对句子改写成定语从句(带有讲解)

1.I receivd a letter.It was from my girl friend.
2.He is the chief. The police caught yesterday.
3.The woman was wearing a bule dress. She was my neihbour.
4.You are looking for the doctor. She is busy.
5.This is our school. You visited last week.

第1个回答  2013-04-05
1)I received a letter which was from my girlfriend
2) He is the thief whom the police caught yesterday.
3) The woman who was wearing a blue dress was my neighbor
4) You are looking for a doctor who is busy
5) This is our school which you visited last week