Упражнения - 4. 16. They (to drink) tea when I (to come) home. 17. The old man (to think) about his plan when he (to fall) asleep. 18. We (to listen) to an interesting lecture yesterday. 19. When I (to enter) the classroom, the teacher (to write) words on the blackboard and the pupils (to copy) them into their exercise-books.

Упражнение - 4

1. They were drinking tea when I came home.
2. The old man was thinking about his plan when he fell asleep.
3. We listened to an interesting lecture yesterday.
4. When I entered the classroom, the teacher was writing words on the blackboard and the pupils were copying them into their exercise-books.

Ответ: смотри решение выше