Ability
Which modal verb do we use to express ability in the present?
Can
Which modal verbs do we use to express obligation?
Must, Have/has to
Which modal verbs do we use to give advice?
Should/ought to
You ________ to do this exercise because it's optional.
You don't have to do this exercise because it's optional.
Which modal verb do we use to express ability in the past?
Could
A responsible worker __________ be on time.
has to
Can ought to be used to express ability?
No
(Necessity)
She _________ speak at least two languages to apply for the job.
needs to
Which modal verb do we use to express ability in other tenses, (e.g. future, present perfect...)
be able to
Is 'should' a modal verb to express obligation?
No, it isn't
Can should be used with ¨to¨?
No.
Clue:
Tomorrow I have a very important exam so I am going to study a lot.
By using Modal Auxiliary Verbs:
I ______ study a lot because I have a very important exam tomorrow.
have to / must
Will you _________ to find a stable job in your field after graduation?
be able
What's the question?
They must complete the assignment this week.
Must they complete the assignment this week?
You ________ spend so much time in front of a screen.
shouldn't
Replace should with another suitable verb:
Martin should pay more attention in class.
Martin ought to pay more attention in class.
I ________ speak English very well a few years ago, but I'm ___________ speak it more fluently now.
able to
(No obligation)
You can be here at 8, but you __________.
don't have to (be).
—Should I go?
—I don't think _________.
you should (go).
_____ learners access so much information before the internet?
Could