Affirmative:
I/you/we/they + have to + hele werkwoord
He/she/it + has to + hele werkwoord
Negative:
I/you/we/they + don't have to + hele werkwoord
He/she/it + doesn't have to + hele werkwoord
Interrogative:
Do + I/you/we/they + have to + hele werkwoord ?
Does + he/she/it + have to + hele werkwoord ?