Поставьте глагол в скобках в подходящее время.(present simple, past simple, future simple, present continuous, present perfect)

1. Mr Smith always (pay) his bills?
2. The Browns are not at home. I believe they just (leave).
3. I (not come) to you yesterday because I (be) very busy.
4. Listen! Somebody (play ) the piano.
5. She (open) the door when her father (ring).

1.pays

2.have left

3.was

4.is playing

5.will open, rings