1. Nam's parents were here last week and give us a present.

Nam's parents, who were here last week, give us a present.

2.I lent you a book. It was written by a friend of mine. She lives in France

The book I lent you was written by a friend of mine, who lives in France.

3.I used to own a dog. People came to the door. The dog never barked at them

The dog which I used to own never barked at people who came to the door.

4. I bought my car from a woman. She lives in a house, You can see the house over there

The woman I bought my car from lives in a house which you can see over there.

5.My friend Bill has decided to buy a motorbike. His car was stolen last week

My friend Bill, whose car was stolen last week, has decided to buy a motorbike.

6.I bought a new car. It cost me a lot of money

The new car which I bought cost me a lot of money.

7.I just talked to the girl. I can never remember her name

I just talked to the girl whom I can never remember the mane/whose name I can never remember.

8.The librarian wants to speak to a man. We borrowed his car yesterday

The librarian wants to speak to the man whom we borrowed his car yesterday/whose car we borrowed yesterday.

9.My friend Albert has decided yo buy a motorbike. His car was stolen

My friend Albert, whose car was stolen, has decided to buy a motorbike.

10.Carol is a vegetarian. I cooked a meal for her last week

Carol, whom I cook a meal for last week, is a vegetarian.

11.I was sitting next to a boy in the exam. He told me the answer

The boy I was sitting next to in the exam told me the answer.

12.I bought a new computer. I costs me a lot of money

The new computer which I bought costs me a lot of money.

13.My neighbours have three children. The children make a lot of noise. My neighbours never apologise

My neighbours have three children who /whose three children make a lot of noise never apologise.

14.Do you know the woman? We are sharing a flat with her son

Do you know the woman whose son we are sharing the flat with (whom we are sharing the flat with her son)?

15.The ship hit an iceberg and shark. Warning messages had been sent to it. The ship ignored these

The ship ,which ignored the warning messages had been sent to, hit an iceberg and shark