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Modal Verbs of
Certainty
Modals of certainty
2
‐ We use modals of certainty to make deductions or
assumptions, that is, to make judgments and opinions
about a situation in the present. These modal verbs are:
must, can’t, may, might and could.
‐ You have just eaten.
You can't be hungry.
‐ You must be Mr. Miller.
We choose the modal depending on
the degree of certainty we have on
what we are saying
When the deduction is about habitual and everyday situations or the
main verb is a stative verb the modal verb is fallowed by an infinitive.
The estructure is the next one:
4
Form Examples
Must Subject + must + infinitive
He is a biologist, he must know a lot
about animals.
Can’t Subject + can't + infinitive
This jacket can't belong to Mike. It's
too small.
May
Might
Could
Subject + may/might + not +
infinitive
I wouldn't go to his house. He might
not be there.
However, we will use modals with the verb to be fallowed by a gerund when
dealing with deductions about temporary situations and actions that happen at
the precise moment in which it is spoken
5
Form Examples
Must Subject + must + be + gerund
Paula is in Hawaii. Now she must
be lying on the beach.
Can’t Subject + can't + be + gerund
They could be talking about the
weekend.
May
Might
Could
Subject + may/might + not +
gerund
He might not be lying.

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Modal Verbs of Certainty

  • 2. Modals of certainty 2 ‐ We use modals of certainty to make deductions or assumptions, that is, to make judgments and opinions about a situation in the present. These modal verbs are: must, can’t, may, might and could. ‐ You have just eaten. You can't be hungry. ‐ You must be Mr. Miller.
  • 3. We choose the modal depending on the degree of certainty we have on what we are saying
  • 4. When the deduction is about habitual and everyday situations or the main verb is a stative verb the modal verb is fallowed by an infinitive. The estructure is the next one: 4 Form Examples Must Subject + must + infinitive He is a biologist, he must know a lot about animals. Can’t Subject + can't + infinitive This jacket can't belong to Mike. It's too small. May Might Could Subject + may/might + not + infinitive I wouldn't go to his house. He might not be there.
  • 5. However, we will use modals with the verb to be fallowed by a gerund when dealing with deductions about temporary situations and actions that happen at the precise moment in which it is spoken 5 Form Examples Must Subject + must + be + gerund Paula is in Hawaii. Now she must be lying on the beach. Can’t Subject + can't + be + gerund They could be talking about the weekend. May Might Could Subject + may/might + not + gerund He might not be lying.