Use Present Perfect or Past Perfect:
1. I received a letter from Susan a few days ago. I ………..(not to receive) letters from her since she left. 2. There are a lot of dirty dishes. We ………….(not to wash up) since morning. 3. I telephoned her after I …………(to think over) her offer. 4. He gave up smoking after he …………(to smoke) for 20 years. 5. How long ………… you …………(to be engaged) before you got married? 6. We ………….(to be) here since 10 o'clock. 7. At last he……….. (to finish) his book. He …………..(to write) it for ten years.

1. I have not received letters from her since she left.

2. We have not washed up since morning.

3. I telephoned her after I had thought over her offer.

4. He gave up smoking after he had smoked for 20 years.

5. How long had you been engaged before you got married?

6. We have been here since 10 o'clock.

7. At last he has finished his book. He has been writing it for ten years.

Коротко: Present Perfect используется, когда действие связано с настоящим моментом. Past Perfect используется, когда одно действие произошло раньше другого действия в прошлом.

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