Modal Verbs of Obligation and Prohibition Explained
1. Modal Verbs of Obligation and
Prohibition!
I am here to tell you about
Modal Verbs of
Obligation and
Prohibition!
Are you ready?
2. Modal Verbs of Obligation and
Prohibition!
What are
Modal Verbs of
Obligation and
Prohibition!
3. Modal Verbs of Obligation and
Prohibition!
• Must / mustn’t
• Have to / don’t have to
4. Modal Verbs of Obligation and
Prohibition!
Present Positive Negative
must / mustn’t strong obligation (possibly Prohibition
based on the speaker’s • You mustn’t smoke here.
opinion)
• I must study today.
have to / strong obligation (possibly no obligation
don’t have to from authority/ • I don’t have to work on
compulsory) Sundays
• Children have to go to • You don’t have to eat
school. anything you don’t like.
(sometimes ‘have got to’)
5. Modal Verbs of Obligation and
Prohibition!
Do you
understand?
You are going to
look at some
photos and make
sentences!
6. Modal Verbs of Obligation and
Prohibition!
The following things
are prohibited
So now make some
sentences!
54. REMEMBER:
Modal Verbs of
Obligation and Prohibition!
Present Positive Negative
must / mustn’t strong obligation (possibly Prohibition
based on the speaker’s • You mustn’t smoke here.
opinion)
• I must study today.
have to / strong obligation (possibly no obligation
don’t have to from outside / compulsory) • I don’t have to work on
• Children have to go to Sundays
school. • You don’t have to eat
(sometimes ‘have got to’) anything you don’t like.