It's a secret. You [shouldn't / mustn't* / needn't / wouldn't] tell anyone.
You've been reading all day. You [could / must* / should / can] be tired.
I understand it very well. You [needn't* / mustn't / shouldn't / wouldn't] explain further.
[Must / Can* / Should / Need] you wait a moment, please?
You [could* / ought to / shall / should] have left your purse in the shop.
He is terribly fat. He [should / can't / mustn't* / would] eat too much.
You have just had lunch. You [wouldn't / can't* / mustn't / shouldn't] be hungry.
The situation was bad but it [could / would have been / should be / could have been*] worse.
It was the principle of the tiling. People [have / should / are able / ought*] to keep their words.
I am so angry with them. I [should / must / can / could*] kill them!
I'll [must / need / be able to / have to*] go now. My friends are waiting.
[Must / Could* / Should / May] you help me carry this downstairs?
It's strange that they [must / should* / would / could] be late.
I [have to / was to / must / had to*] leave the party early last night. I wasn't very well.
I [would* / shall / could / must] rather stay at home than go out.
