Exercise 2. Сделайте предложения:
a) отрицательными.
1. I have been cleaning my room since morning.
2. They have been working in the garden for three hours.
3. I have been writing an essay since nine o’clock.
4. Fred has been playing tennis for an hour.
b) во
Объяснение:
1 I haven't been cleaning
2 They haven't been working
3 I haven't been writing
4 Fred hasn't been playing
1 has her aunt been working
2 has the music been playing
3 have we been translating
4 have students been preparing