Exercise 79. Постройте отрицания и вопросы из следующих предложений,
1. He had already been working for 2 hours by 8 a.m. 2. It had
been raining all night yesterday. 3. They had been playing for 30 min-
utes when Mom called. 4. They had already been watching a film for
15 minutes when I woke up. 5. They had been swimming for too long
when the rain started.