Question

must
have to
has to
had to
I ... study this subject. *

mustn 't
don't have to
doesn't have to
haven't to
You ... help your sister with the homework. *

have to
has to
must
had to
Be careful! You ... touch this. *

haven't
don't have to
doesn't have to
mustn't
Kitty ... include this material. Her report is good enough. *

doesn't have to
don't have to
hasn't
mustn't
You ... attend this exhibition! It's presenting a wonderful collection of works of art! *

have to
has to
had to
must
We didn't have money to get on the bus, so we ... walk home. *

have to
has to
had to
must
We ... walk home because we had enough money to het a taxi. *

don't have to
doesn't have to
didn't have to
mustn't
It will be her first visit to Arthur's parents, but she ... dress up. They will like her anyway. *

don't have to
doesn't have to
won't have to
didn't have to
When Karen gets divorced, she ... find a job to earn her living. *

have to
will have to
had to
has to