can'(t)
When we want to talk or ask about permission,we often use the modal verb can / can’t.
You can go to the party but you can’t stay late.
Can I borrow your phone to make a call?
must(n't)
To say what isn’t allowed, we use can’t or mustn’t.
You can’t park here. (This is a fact / rule.)
You mustn't forget to study for the test, otherwise you will fail.