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When we were at school we MUST / HAD TO wear a uniform
HAD TO
You DON'T NEED TO / SHOULDN'T be an expert to use basic computer programs.
DON'T NEED TO
You MUST / OUGHT to switch off your phone during classes.
OUGHT
Did you MUST / HAVE TO take a lot of tests last trimester?
HAVE TO
You SHOULD / OUGHT take breaks from working every 20 minutes.
SHOULD
We DON'T HAVE TO / MUSTN'T talk during the exam.
MUSTN'T
Visitors SHOULDN'T / DON'T NEED TO feed the zoo animals.
SHOULDN'T
Where OUGHT TO / SHOULD we put the empty pizza boxes?
SHOULD
I couldn't go to the party because I HAD TO / MUST go to the dentist.
HAD TO
