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2) when he (see) his friends they (cross) the road
3) when i (come) home my little sister (sleep)
4) Jack (play) computer games yesterday
5) I (decorate) the house while my granny (cook) meal
6) they (do) homework from five till nine yesterday
7) she (send) me a lot of messages last week

1) when i get's up, mum and dad drink coffee

2) when he see his friends they crosses the road

3) when i came home my little sister was sleeping

4) Jack plays computer games yesterday

5) I decorate the house while my granny cooks meal

6) they do homework from five till nine yesterday

7) she sends me a lot of messages last week

1) When i got up, mum and dad were drinking coffee.

2) When he saw his friends they were crossing the road.

3) When i came home my little sister was sleeping.

4) Jack was playing computer games yesterday.

5)  I decorated the house while my granny was cooking meal.

6) They were doing homework from five till nine yesterday.

7) She sent me a lot of messages last week.

Объяснение:

1. We wrote a letter to the president.

   A letter to the president was written by us.

2. Mother made a birthday cake for her son.

   A birthday cake was made by Mother for her son.

3. The teacher read us a story.

 A story was read to us by the teacher.

4. My sister usually brings me apples.

Apples are usually brought to me by my sister.

5. They found her a good job.

   A good job was found (by them) for her.

6. Somebody calls me every evening.

   I am called every evening.

7. My friend sent a telegramme to my parents.

  A telegramme to my parents was sent by my friend.

8. The girl sold them some flowers.

   Some flowers were sold to them by the girl.

9. I told the truth to her.

   She was told the truth by me.