It is used to advise someone to do something.
It is used to order someone to do something.
It is used to say something is not necessary (noodzakelijk).
It is used to advise someone to not to do something.
It is used to say something is necessary (noodzakelijk).
It is used to order someone to not to do something.
shouldn't
have to
must
should
don't have to
mustn't
