You _______________ wear a helmet when you ride a bike. It's the law!
have to
I can't get a tattoo because I'm sixteen. In my country, you 1______________________ be eighteen to get it. But you 2__________________ be eighteen to get a driving licence. You can do it when you're seventeen.
1 have to ; 2 don't have to
X: _________________________ (your friend) do her homework tonight? Y: No, she ________________________, but she ________________________ look after her little brother.
Does your friend have to; doesn't; has to