We ______ go to the mountain this weekend.
have to
You _________ come with us, we can go alone.
don't have to
It _________ be my sister, I was waiting her call.
has to
________ they _________ bring their homework?
Do they have to
_________ he _________ study this weekend?
Does he have to
Yes, we _________
do
No, he _________
doesn't
I am late, I _________ look for my keys.
have to
