Modal verbs (hulpwerkwoorden)
Need - have to - must = verplichting/ iets wat (zou) moeten.
(must= vanuit iemand zelf)
Can = iets wat kan/ toegestaan is.
Don't have to - don't need to = iets hoeft niet/ is niet verplicht
Mustn't - can't = iets mag niet/ is verboden
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You have to do your homework because the teacher is going to check it. You don't have to do ex. 5 though.
I must catch the bus earlier tomorrow because I can't miss the test.