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!

8. You mustn’t eat
junk food!

10. You mustn’t use
your phone while you're
driving!

12. You mustn’t
drink alcohol!

14. You mustn’t
smoke!

16. You mustn’t
come in!

18. You mustn’t
sleep in class!

20. You mustn't
get stressed!

21. Modal Verbs of Obligation and
Prohibition!
The following things
are obligatory
So make some sentences!

23. You must
eat well!

25. You must
keep fit!

27. You must recycle
rubbish!

29. You must speak
English in class!

31. You must do
the homework!

32. Modal Verbs of Obligation and
Prohibition!
The following things
are compulsory
So make some sentences!

34. You have to
have a passport
to travel to
another country!

36. You have to
look for a job!

38. You have to
pay taxes!

40. In most of the world you have to drive
on the right!
In some countries you have to drive on
the left!

42. They have to
wear a uniform!

43. Modal Verbs of Obligation and
Prohibition!
The following things
are not obligatory
So make some
sentences!

44. Don’t have to =

46. You don’t have to
get up early at
the weekend!

48. You don’t have to
wear a suit at
the weekend!

50. You don’t have to
work on holiday!

51. DO NOTHING!!!

52. You don’t have to
do anything
on holiday!
DO NOTHING!!!

53. The End! You
don’t have to do
any more!

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.