Question

Find mistakes and correct them.   1) Greg and Bob had looked for their dog for two hours before they found it sleeping under a bench in the park. 2) We had been boating in the lake at 10 o'clock yesterday morning. 3) She finished cooking dinner by the time her children returned from school. 4) When Henry opened the door of the living room, his little brother watched cartoons on TV. 5) Sally took a piece of paper and had written her phone number on it. 6) We were driving for six hours before we saw a small hotel beside the road. 7) After my friends left I washed the dishes and switched on the TV set. 8) What had you been doing at the moment the fire broke out? 9) How much was your camera costing a year ago? 10) What were Nelly doing while you were doing the ironing?

Answer 1

1) Greg and Bob had been looking for their dog for two hours
before they found it sleeping under a bench in the park.

2) We boated или were boating in the lake at 10 o'clock
yesterday morning.

3) She had finished cooking dinner by the time her children
returned from school.

4) When Henry opened the door of the living room, his
little brother was watching cartoons on TV.

5) Sally took a piece of paper and wrote her
phone number on it.

6) We had been driving for six hours before we saw a small
hotel beside the road.

7) After my friends left I washed the dishes and
switched on the TV set. тут все ок, Past simple - последовательность действий, если только вместо left можно поставить had left

8) What were you doing at the moment the fire
broke out?

9) How much did your camera cost a year ago?

10) What were Nelly doing while you were doing the
ironing? все правильно, Past Continuous - Два или более длительных действий в прошлом, происходивших одновременно

Answer 2

1. Greg and Bob had been looking for their dog for two hours before they found it sleeping under a bench in the park.
2. We went boating in the lake at 10 o'clock yesterday morning.
3. She had finished cooking dinner by the time her children returned from school.
4. When Henry opened the door of the living room, his little brother was watching cartoons on TV.
5. Sally took a piece of paper and wrote her phone number on it.
6. We had been driving for six hours before we saw a small hotel beside the road.
7. After my friends left, I washed the dishes and switched on the TV set.
8. What were you doing at the moment the fire broke out?
9. How much did your camera cost a year ago?
10. What was Nelly doing while you were ironing?