The lecturer ... all the students guestions when he finished his lecture

11. Have you read the book yet?
- Вопрос задаётся, чтобы узнать, прочитал ли кто-то определённую книгу до настоящего момента.

12. How many letters have they written so far?
- Вопрос задаётся, чтобы узнать количество писем, которое они успели написать до настоящего момента.

13. When did he tell you that?
- Вопрос задаётся, чтобы уточнить, когда он рассказал вам об этом?

14. Were you at home last night?
- Вопрос задаётся, чтобы узнать, находился ли кто-то дома вчера вечером.

15. How often have you traveled abroad till now?
- Вопрос задаётся, чтобы узнать, с какой частотой вы уже путешествовали за границу до настоящего момента.

16. He has just left his house.
- Используется Present Perfect, чтобы указать на действие, произошедшее в очень недавнем прошлом. В данном случае, он только что покинул свой дом.

17. We built a tree house last week.
- Используется Past Simple, чтобы указать на действие, произошедшее в прошлом. В данном случае, мы построили домик на дереве на прошлой неделе.

18. Two years ago, Fiona broke her leg.
- Используется Past Simple, чтобы указать на действие, произошедшее в прошлом. В данном случае, два года назад Фиона сломала свою ногу.

19. I have already washed the dishes.
- Используется Present Perfect, чтобы указать на действие, которое произошло до настоящего момента. В данном случае, я уже помыл посуду.

20. The other day, our cat brought home a mouse.
- Используется Past Simple, чтобы указать на действие, произошедшее в прошлом. В данном случае, на днях наша кошка принесла домой мышь.

1. What were you doing this time last Monday? - I was watching TV while John was cooking dinner.
- In this sentence, the past continuous tense is used to describe an ongoing action in the past. "Were you doing" refers to an action that was happening at a specific time in the past, and "was watching" and "was cooking" are the corresponding actions.

2. Clare was speaking on the telephone when the doorbell rang.
- Again, the past continuous tense is used to describe an ongoing action in the past. "Was speaking" and "rang" are the corresponding actions.

3. Dina had been working on the computer for three hours before she started getting ready to go out.
- In this sentence, the past perfect continuous tense is used to describe an action that started in the past and continued up to a specific point in the past. "Had been working" refers to an action that was ongoing for a period of time, and "started" refers to the point at which the action changed.

4. What happened exactly? Someone jumped out in front of the car.
- The past simple tense is used here to describe a completed action in the past. "Happened" and "jumped" are the corresponding actions.

5. They were hiking up the hill when the volcano erupted.
- The past continuous tense is used to describe an ongoing action in the past. "Were hiking" and "erupted" are the corresponding actions.

6. How did you meet? - When we were walking along the beach.
- The past simple tense is used here to describe a completed action in the past. "Did you meet" and "were walking" are the corresponding actions.

7. As Maria was living and working, she met Jimmy.
- The past continuous tense is used here to describe an ongoing action in the past. "Was living and working" and "met" are the corresponding actions.

8. Garry had been in the navy for years before he became a commercial diver.
- In this sentence, the past perfect continuous tense is used to describe an action that started in the past and continued up to a specific point in the past. "Had been" refers to an action that was ongoing for a period of time, and "became" refers to the point at which the action changed.

9. By the time Bob came home, Laura had been cooking dinner.
- The past perfect continuous tense is used here to describe an action that started in the past and continued up to a specific point in the past. "Had been cooking" refers to an action that was ongoing for a period of time, and "came" refers to the point at which the action changed.

10. Lionel had written several pages before he realized he was off the point.
- The past perfect tense is used here to describe an action that started and ended before another past action. "Had written" refers to an action that was completed before "realized."

11. What were you doing at lunchtime? - Why were you trying to call me?
- The past continuous tense is used here to describe an ongoing action in the past. "Were you doing" and "were trying to call" are the corresponding actions.

12. You were typing your essay when the computer crashed.
- The past continuous tense is used here to describe an ongoing action in the past. "Were typing" and "crashed" are the corresponding actions.

13. Why didn't you come last night? – Because I was studying for my exams.
- The past continuous tense is used here to describe an ongoing action in the past. "Didn't come" and "was studying" are the corresponding actions.

14. They had been waiting for two hours before Ann finally arrived.
- In this sentence, the past perfect continuous tense is used to describe an action that started in the past and continued up to a specific point in the past. "Had been waiting" refers to an action that was ongoing for a period of time, and "arrived" refers to the point at which the action changed.

15. Why didn't you come last night? – Because I was studying for my exams.
- The past continuous tense is used here to describe an ongoing action in the past. "Didn't come" and "was studying" are the corresponding actions.