Which modal verbs do we use to express obligation?
Must and have to
Which modal verbs can we use to express deduction?
must / could
I _____ go alone tonight.
mustn't
(+) We _____ get up early on weekends if we make a commitment.
can
They are on a trip to England. Their house ____ be empty.
must
You don't had to behave like that in class yesterday.
You didn't have to behave like that in class yesterday.
Students _____ late to school. (arrive)
mustn't arrive
(-) You _____ be right! I always know the answers.
cannot
I ____ go to the cinema this afternoon, but today I'm ill.
could
Put the words in the correct order: you / if / mustn't / eighteen / are / drive / under / you
You mustn't drive if you are under eighteen.
Put the words in the correct order: he / to / uniform / went / could / school / he / choose / when / not / wear / a / to / ?
Could he choose not to wear a uniform when he went to school?
Put the words in the correct order: can't / results / studied / exam / this / a lot! / on / be / his / the / he
This can't be his results on the exam. He studied a lot!
How do you use "must" in a past tense?
"had to"
Write a sentence using the modal verb "must" in negative.
Open answer.
Write a sentence using the modal verb can and another sentence using the modal verb could.
Open answer.
Write a sentence using the modal verb "must" (deduction).
Open answer.
Do doctors should help people if they need it? Yes, they do.
Should doctors help people if they need it? Yes, they should.