№3.
1. It was very cold yesterday (Perfect). (Вчера было очень холодно.)
2. When did you meet him (Simple)? (Когда ты встретил его?)
3. I haven't seen her since 1999 (Perfect). (Я не видел её с 1999 года.)
4. How many strawberries have you gathered (Simple)?
5. Where did you put the old magazines (Simple)? (Куда ты положил старые газеты?)
6. The rain has stopped but a cold wind is still blowing (Simple). (Дождь прекратил, но холодный ветер до сих пор дует.)
7. We have already founded the book in the library (Perfect).
8. He has just finished his work (Perfect). (Он только что закончил свою работу.)
9. They have not returned from the theatre yet (Perfect). (Они ещё не вернулись из театра.)
10. He was ill last weel (Simple), but now he had recovered (Simple). (Он был болен на прошлой неделе, но сейчас он выздоровел.)
11. Why you did you leave so early yesterday (Perfect)? (Почему ты вчера так рано ушёл?)
12. I can't recognize you. You have changed so much (Simple).
13. What books did you read when you lived abroad (Simple)? (Какие книги ты читал, когда жил за границей?)
14. We started our term work two months ago (Perfect).
15. - Have you bought the tickets (Simple)? - I bought them a couple of days ago (Perfect). (- Ты купил билеты? - Я купил их пару дней назад.)