Завершите предложени, раскрыв скобки
1.When the bell rang the children (to run) into the classroom and (to take) their seats.
2. When I opened the door, the lesson (to begin) and the teacher (to explain) something to the class  
3.Before we (to take) the boy to the theatre he (never to see) a play.
4.I (to clean) the carper when the dog (to come) and (to shake) himself
5.By the time we (to arrive) the party (to finish)
6.-When you (to do) when I (to call) you?- I ( to cook)

1. When the bell rang the children (were running) into the classroom and ( taking) their seats. 2. When I opened the door, the lesson (had begun) and the teacher (was explaining) something to the class. 3. Before we (took) the boy to the theatre he (had never seen) a play. 4. I (was cleaning) the carper when the dog (came) and (to shook) himself. 5. By the time we (arrived) the party (had finished). 6. - What (were you doing) when I (called) you?- I (was cooking).