He should / shouldn’t apologise for being rude.
SHOULD
You don’t have to / mustn’t confirm tomorrow’s meeting.
DON'T HAVE TO
We should / shouldn’t give them a reduction – they aren’t good customers.
SHOULDN'T
If you feel ill, you should / shouldn’t drive home.
SHOULDN'T
I don’t have to / mustn’t forget to print new business cards.
MUSTN'T
Sally doesn’t have to / mustn’t sort the mail. I can do it.
DOESN'T HAVE TO
Can / Can’t you please find an Italian translator?
CAN
You don’t have to / mustn’t interrupt the speaker.
MUSTN'T
James can / can’t speak Japanese – he lived in Tokyo for years.
CAN
Lola should / shouldn’t check the calendar before she schedules a meeting.
SHOULD
Oh no, I can / can't turn on my screen.
CAN'T