Слова можно менять на другие подходящие.
A human body always requires a balanced diet.
A human body is requiring a balanced diet now.
A human body has already required a balanced diet.
A human body has been requiring a balanced diet since morning.
A human body required a balanced diet yesterday.
A human body was requiring a balanced diet at 5 o'clock yesterday.
A human body had required a balanced diet by 5 o'clock yesterday .
A human body had been requiring a balanced diet for two hours when I recognized.
A human body will require a balanced diet tomorrow.
A human body will be requiring a balanced diet at 5 o'clock tomorrow.
A human body will have required a balanced diet by 5 o'clock tomorrow.
A human body will have been requiring a balanced diet for two hours when I recognize.
Future-in-the-Past
A human body would require a balanced diet the next day.
A human body would be requirng a balanced diet at 5 o'clock the next day.
A human body would have required a balanced diet by 5 o'clock the next day.
A human body would have been requiring a balanced diet for two hours when I recognized.
2.
? Did the bus leave while I was talking to a friend?
+ the bus left while i was talking to a friend.
- the bus did'nt leave while I was talking to a friend.
3.
- You weren't sitting in the departure lounge when your plane departed.
+ You were sitting in the departure lounge when your plane departed.
? where you sitting in the departure lounge when your plane departed?
4.
? Was he being silly when he fell and hurt his foot?
+ he was silly when he fell and hurt his foot.
- he was'nt silly when he fell and hurt his foot.
Объяснение: