Wanneer gebruik je het?
Bij regels/ verplichtingen of wanneer iets nodig is
Hoe gebruik je het?
have/ has to + werkwoord
X: don't/ doesn't (do not/ does not) have to + werkwoord
?: Do ... have to + werkwoord
Do we have to work in our book?
We have to listen to the teacher now so you don't have to work in your book.