Must
You must give up smoking.
Should
I should be at school before 9:00.
Must not
You must not drink alcohol.
Should (2)
What should I do?
Shouldn’t
Why shouldn’t I go there?
Must
You must give up smoking.
Should
I should be at school before 9:00.
Must not
You must not drink alcohol.
Should (2)
What should I do?
Shouldn’t
Why shouldn’t I go there?