Ex 1:

1. had finished

2. had lived

3. had / eaten

4. had never been

5. had never seen

6. had studied

7. had lost

8. had made

9. had broken

10. had stolen. 

Ex 2:

1. had drunk

2. had finished

3. had never met

4. had lived 

5. had spent

6. had not been 

7. had slept

8. had waited

9. had already done

10. had built.

Ex 3:

1. had had

2. had just had

3. had left

4. had worked 

5. had divorced 

6. had been chosen 

7. had helped  

8. had refered

9. had just finished 

10. went /had finished.

Ex 1:

1. After she had finished breakfast, she left the house.

2. Before he came to Warsaw he had lived in Prague.

3. She had already eaten by the time he left.

4. He told me he had never been to Australia before.

5. He told me he had never seen anything like that.

6. Jane had studied for 4 hours when he came home.

7. I couldn't get in because I had lost my keys.

8. I felt very stupid because I had made a lot of mistakes.

9. I paid for the window because my son had broken.

10. I told him I didn't know who had stolen his pen.

Ex 2:

1. I was feeling very thirsty because I had drunk too much alcohol the night before.

2. I had finished my homework before 10 o'clock last night.

3. When I saw her I knew we had never met before.

4. Before he came to Ha Noi he had lived in Da Nang.

5. He had spent three years in Taiwan when he was a child.

6. He had not been to Cape Town before 2000.

7. We had slept for 2 hours when he woke us up.

8. They had waited at the station for 90 minutes when the train finally arrived.

9. When she went out, she had already done her homework.

10. The storm destroyed the sandcastle that we had built.

Ex 3:

1. By 2 o'clock we had had lunch.

2. We had just had lunch when she arrived.

3. When we came to the station, the train had left.

4. Tim left very tired, he had worked all day long.

5. I met them after they had divorced each other.

6. Lan said she had been chosen as a beauty queen two years ago.

7. An idea occured to him that she herself had helped him very much in the evry night.

8. She wondered why you had refered to her unhappy childhood.

9. When I entered the dining room, she had just finished washing the dishes.

10. They went home after they had finished their work.