1. Shall we have a cup of coffee after having breakfast?
-> Shall we Vnt?
2. You must hand in the report by 9 p.m tonight 
-> must Vnt
3. Could you turn the air-conditioner off please?

-> Could you Vnt?
4. You shouldn’t interrupt others

->  shouldn't + Vnt
5. May I park here?

->  May I Vnt?
6. The bank must be informed if you lose your credit card

->  S must be VPII by O
7. Shall we make a birthday cake for our mother ourselves?

-> Shall we Vnt?
8. You ought to brush your teeth at least twice a day

-> ought to Vnt : nên làm gì
9. The boy might be scolded for his carelessness

-> S might be VPII by O.
10. I was able to prepare for the party on my own without any help 

-> be able to Vnt