Students can't / don't have to wear a school uniform when they study online classes
don't have to
Children can't/ have to watch this movie because it has many violent scenes.
can't
Everyone can/ must start work at 9. It's a rule.
must
I can/ don't have to take the bus. It's easy to walk there.
don't have to
You must not/ don't have to do this work today.
don't have to
In Singapore, you must/ must not litter in public. You will be fined.
must not
Simon must not/ doesn't have to be rude to the manager .He'll lose his job.
must not
We can/ must wear casual clothes on a Monday. It's your choice.
can
You can/ have to believe in your idea for it to be a sucess.
have to
You can't/ can do this job unless you have training
can't