Ответ:

ex1

1 had been driving

2 had collected

3 hadn't been

4 had been snowing

5 had been walking

6 had seen

7 had studied

8 hadn't eaten

9 had broken

10 had opened

ex2

1 The finished the house after they had been building it for a year.

2 She didn't eat anything because she had already had lunch.

3 He told her that he had seen her before.

4 He was sos exhausted because he had been cutting grass all day.

Объяснение: