This document discusses modal verbs used for making deductions. It explains that modal verbs of deduction include must, can't, could, and might. These verbs are used with a subject and bare infinitive to express possibilities (could/might) or impossibilities (can't). An example is given of using these modal verbs to make deductions about why a person is dressed in a certain way, such as "She might go to her office" or "She can't be a rock star."

1. Modal
Verbs:
.
Modals of Deduction

2. Index
 General classification
 Guessing professions
 Modals of deduction

3. Classification
 Ability  can, could, to be able to
 Permission  may, can, could, might
 Possibility  may, might, can, could
 Prohibition  must not, can’t, may not
 Polite Request  may, could, will, would

4.  Deductions  must, can’t, could, might
 Duty  must, should, ought to
 Orders  must, shall, will
 Necessity  must, to have to, need to
 Advice  should, must, ought to

5. Could you guess the different
professions?
1 2 3
4
5
6
1
He could be…
He must be…
He can’t be…

6. Modals of Deduction
Subject + could/might/must + bare infinitive
(If we think the statement is possible)
Subject + can’t + bare infinitive
(If we think the statement is impossible)
Why is she
dressed like
that?
She might go
to her office.
Is she a rock
star?
She can’t be a
rock star! She
doesn’t look
like that…