Exercise 3. Напишите глагол в скобках в необходимом времени группы Perfect Continuous.
1. Sam … (to learn) French for three years.
2. Children … (to sunbath) on the beach for several hours by the time their parents find out about it.
3. Ann … (to cook) breakfast for ten minutes.
4. The boys … (to fish) for three hours before Tom caught the first fish.
5. Fred said he … (to wait) for us for half an hour.
6. David was irritated because the police inspector … (to ask) him questions for more than an hour.
7. Jacky … (to live) in Canada for six years next February.

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