I ____ tell him the truths, I've kept this a secret for too long!
must
You ___ tell anyone what I just told you. It's a secret.
mustn't
The museum is free. You ___ pay to get in.
don't have to
Children ___ tell lies. It's very naughty.
mustn't
I ___ do my washing because my mother does it for me.
don't have to
You ___ smoke inside the school.
mustn't
You can borrow my new dress, but you ___ get it dirty.
mustn't
He ___ do this work today, because he can do it tomorrow.
doesn't have to
You____ help your mum to clean the house.
should/must
We ___ forget to lock all the doors before we leave.
mustn't
We ___ stay in a hotel in London; we can stay with my brother.
don't have to
I ___ spend too much money today, because I've only got a little left.
mustn't
They ___ get up early today, because it's Sunday.
don't have to
- I feel fat. - You___go to the gym
should/must
Don't you know that you ___ wear a seat belt in the car.
have to
I ___ sleep, I am exhausted.
must/should
