While I 1)was copying the exercise, my friends 2)were describing a picture.
When we came in, the children 3)were cleaning their desks.
We met her at the bus stop. She 4)was waiting for the bus.
Some of the children 5)were skiing while other children 6)were skating. Everybody 7)was having a lot of fun.
When we came the family 8)was getting everything ready for Christmas. Bob and Helen 9)were decorating the Christmas tree.
The girls 10)were feeding the birds in the garden while the boys 11)were making a bird-house.
