1. C
MODAL
AUXILIARIES
Ability, permission, possibility, necessity……

2. Expressing Possibility:
May / Might / Could
• May and might express possibility
in the present or future.
• May is also used to give permission.
• Negative form: may not / might not
• could not , couldn’t.
Look at those dark
clouds. It could
start raining any
minute.

3. It may rain tomorrow.
It might rain tomorrow.
He may / might be
sick today.Why is not Jhon in class?

4. • May I please borrow your pen?
• Could I borrow your pen please?
• Can I borrow your pen?
Please can come at the
end of the question,
and can be omitted
from the question.

5. • Should , ought to, had better have
the same meaning. They mean: “This
is a good idea. This is a good
advice”.
• Negative: Should not , shouldn’t.

6. He looks very tired.
He shouldn’t stay
late.He had better
study tonight.
You ought to drink a
glass of wáter .

7. Expressing necessity:
Have to, Must.
• They express the idea that something is necessary.
You have to go at the hospital.
You most finish the homeword.

8. Expressing lack of necessity:Don’t have to.
Expressing Prohibition: Must not.
Don’t / doesn’t have
to express the idea
that something is not
necessary.
Must not express
prohibition.
You must not drop
the school.

9. You don’t have to
read the next
page.
You must drive with
your driver’s license.

10. Logical conclusions: Must
He must be
thirsty.She must be tired.