(No) Obligation
Which modal verbs do we use to express obligation? And no necessity?
Must and have to / Don't have to
Which modal verb do we use to express prohibition?
Mustn't
Which modal verbs express ability and possibility?
can - could
Which modal verb do we use when something is allowed?
can
Carol must finishes her homework for tomorrow.
Carol must finish her homework for tomorrow.
You _____ take your password when you travel abroad.
must
I _____ go alone tonight. It's dangerous!
mustn't
(+) We _____ get up early on weekends.
can
They are on a trip to England. Their house ____ be empty.
must
You don't had misbehave in class yesterday.
You didn't have to misbehave in class yesterday.
She _____ answer all the call phones at work every day.
has to
Students _____ late to school.
mustn't be
(-) You _____ shout in class tomorrow! We are taking an exam.
cannot
You __________ be home at 10.
must
Do she have to play the guitar at the concert?
Does she have to play the guitar at the concert?
Put the words in the correct order: be / I / on / time / must
I must be on time
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 / uniform / goes / can / school / he / choose / when / a / to / ?
Can he choose a uniform when he goes to school?
Put the words in the correct order: can't / exam / studied / this / a lot! / be / his / he
This can't be his exam. He studied a lot!
Parents can't to let their children miss school.
Parents can't let their children miss school.
Explain the use of the modal: My sister must work everyday at 8.
Internal obligation
Explain the function of the modal: Students mustn't speak while they are taking an exam
Prohibition
Explain the use of the modal: Children can't study more than 3 hours in a row.
Not allowed
Explain the use of the modal: They can't be at university. I've seen them at the supermarket.
Impossibility
They must come to the party at 8? Yes, must they.
Must they come to the party at 8? Yes, they must.