5. HAVE TO/MUST
It has to be very heavy to carry.
I must do my best to pass the exam.
6. DON’T HAVE TO/MUSTN’T
You don’t have to go to the supermarket. I’ve
already gone.
You mustn’t forget to present the documents
to the accountant.
7. MODALS FOR PRESENT DEDUCTION
Must
He must live near here because he comes to work on
foot.
Can’t
It can’t be a burglar because all the doors and
windows are locked.