EXERCISE 1
1. When we came in, the children were cleaning their desks.
2. We met her at the bus stop. She was waiting for the bus.
3. Some of the children were skiing while other children were skating. Everybody was having a lot of fun.
4. When we came the family was getting everything ready for Christmas. Bob and Helen were decorating the Christmas tree.
5. The girls were feeding the birds in the garden while the boys were maling a bird-house.
EXERCISE 2
1. Alison was having lunch at two o'clock yesterday.
2. Edward and Henry were playing the guitar all the evening.
3. Ben was running in the park in the morning yesterday.
4. Lucy was ironing the clothes from 4 to 6 o'clock last Saturday.
5. You were sleeping for three hours in the afternoon.
6. Julia was listening to music at this time yesterday.
7. We were playing on the playgrounf all day last Sunday.
EXERCISE 3
1. The teacher wasn't explaining the exercise to the pupils.
2. Amanda wasn't travelling around Africa at that time.
3. I wasn't doing the shopping yesterday.
4. There weren't flying to Wales at 6 o'clock yesterday.
5. It wasn't raining hard all day last Tuesday.
Объяснение: