Which modals are used to express advice?
should and ought to
Can to I go to the doctor? (advice)
Should I go to the doctor?
You _____ confused. He would never cheat on me.
must be
Should I leave the classroom? (permisión)
Can/May I leave the classroom, please?
They_________travel (future possibility) to India next year.
may/might/could
This _____ happening! I lost my job! (deduction)
can't be
Which modal expresses ability, opportunity or permission?
CAN
I can read when I was five.
I could/was able to read when I was five.
Tomorrow you ___________ bring your books.(lack of obligation, optional)
don't have to/needn't
You look pale, you_______be sick (my deduction)
must be
Which modals are used to express a present necessity or obligation?
have to & must
Last year, he must take the First Certificate test (past obligation)
Last year, he had to take the First Certificate test.
They have been studying the whole day, so they________be exhausted (deduction)
must be
Which modal is used to express a past obligation?
had to
I am certain that she mustn't be ill, I just saw her.
I am certain that she can't be ill, I just saw her.
If you want to lose weight, you_______ exercise (advice) more
should
You ____ serious! We agreed on it last night!(deduction)
can't be