Ответ:
Exercise 3. Complete the sentences. Use the correct affirmative or negative form of the Present Perfect.
1. I saw an alien last night! But I have not told my mum.
2. 'Where's my pencil?' 'Jane has taken it.'
3. It's the last day of my holiday, and I have written postcards to all my friends.
4. John can't play tennis today. He has lost his tennis shoes.
5. 'You have eaten all of the pizza!'
6. He isn't very tired. He has not run as far as me.
7. Oh, no! I have not done my homework!
Exercise 4. Use the correct form of the Present Perfect.
1. Have you been to Great Britain?
2. Have you finished your test?
3. Have all the students prepared the text for retelling?
4. He has just graduated from the mining department of the university.
5. He says he has never seen the girl before.
6. Unfortunately, I have not seen the film.
7. Have you ever travelled to the USA?
8. She says she has changed her mind.
9. They say they have never been at this place before.
10. Nobody has seen him today.