Конечно! Вот расширенный ответ с правильно раскрытыми скобками, используя Past Simple и Past Continuous:
1) They were watching TV when the lights went off.
- Используем Past Continuous для описания длительного действия (watching TV) и Past Simple для кратковременного действия (the lights went off).
2) They did not see me because they were talking to each other.
- Past Simple для действия, которое не произошло (did not see), и Past Continuous для действия, которое происходило в тот момент (were talking).
3) While the children were sleeping, their parents were watching TV.
- Оба действия продолжительные и происходили одновременно, поэтому используем Past Continuous для обоих.
4) It started to rain while she was watering the flowers in her garden.
- Кратковременное действие (started) в Past Simple и длительное действие (was watering) в Past Continuous.
5) This time last week I was lying on the beach.
- Длительное действие в определённый момент в прошлом, поэтому используем Past Continuous.
6) While he was taking a shower, his dogs were eating his steaks.
- Оба действия происходили одновременно, поэтому используем Past Continuous для обоих.
7) When they left the museum, the sun was shining.
- Кратковременное действие (left) в Past Simple и длительное действие (was shining) в Past Continuous.
8) We were walking in the mountains when we heard a piercing scream.
- Длительное действие (were walking) в Past Continuous и кратковременное действие (heard) в Past Simple.
9) I was having a beautiful dream when the alarm went off.
- Длительное действие (was having) в Past Continuous и кратковременное действие (went off) в Past Simple.
10) When the teacher arrived all the students stood up.
- Оба действия кратковременные и последовательные, поэтому используем Past Simple для обоих.
11) Did you play a musical instrument when you were a kid?
- Вопросительное предложение с кратковременным действием (play) в Past Simple и состоянием (were) в Past Simple.
12) We were going down the road at 100 kph when the wheel fell off.
- Длительное действие (were going) в Past Continuous и кратковременное действие (fell off) в Past Simple.
13) He came in, took off his coat and sat down.
- Последовательные кратковременные действия в Past Simple.
14) Yesterday I spent two hours cleaning my living room.
- Кратковременное завершённое действие в Past Simple.
15) I finished work, walked to the beach, and found a nice place to swim.
- Последовательные кратковременные действия в Past Simple.