(No) Obligation
Which modal verbs do we use to express obligation? And no obligation?
Must and have to / Don't have to 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 verbs do we use when we aren't sure about something? And when we are sure?
might not - could - might can't - must
Carol must finishes her homework for tomorrow.
Carol must finish her homework for tomorrow.
You _____ take your password when you travel abroad
have to (external obligation)
I _____ go to the hospital tonight.
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 behave in class yesterday.
You didn't have to behave in class yesterday.
She _____ answer all the phone calls at work yesterday.
had to
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
(-) You _____ shout in class yesterday! We were taking an exam.
couldn't
I ____ go to the cinema this afternoon. I don't know yet.
might / could
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: term / must / she / hard / to / last / exams / studied / her / pass / have
She must have studied hard to pass her exams last term
She ___________ wait in line like everyone else. (future)
She will have to wait in line like everyone else.
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 / exam / studied / this / a lot! / be / his / he
This can't be his exam. He studied a lot!
Do doctors might help people if they need it? Yes, they do
Might doctors help people if they need it? Yes, they might.