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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  ran into the classroom and took their seats.

2. When I opened the door, the lesson  began 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 carpet when the dog came and  shook himself

5.By the time we had  arrived the party had  already finished

6.-What were you doing when I called you?- I was cooking