В первой фотографии само задание, а во второй правило)

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

ответ:

while i was copping the exercise my friends were describing a picture. when we came in the children were cleaning the desks. we met her at the bus stop. she was waiting for the bus. some of the children were skiing while other children were skating. everybody had a lot of fun. when we came the family were getting everything ready for christmas. bob and helen were decorating the christmas tree. are the girls were feeding the birds in the garden while the boys were making a bird-house.

объяснение:

если я правильно поняла, то нужно было поставить в нужное время?