1. MUSTMUST MUSTN’TMUSTN’T
She MUST be in bed because
she has the flu.
Peter MUSTN’T sleep during
the class.
Obligation
Strong advice
Jack MUST brush his teeth
before going to bed.
You MUSTN’T smoke.
Prohibition

2. Sam ____________ watch TV for so many hours.
MUSTMUST MUSTN’TMUSTN’T

3. MUSTMUST MUSTN’TMUSTN’T
Andrew____________ wash his hands before meals.

4. Tim ………………….. be careful with his school material.
MUSTMUST MUSTN’TMUSTN’T

5. 1.Kate is ill, so she .................. see the doctor.
2.You ................... throw litter on the floor.
3.You ................. make noise in the library.
4.It is raining so we .................. take our umbrellas.
5.This is a secret. You ................... tell anybody.
6. We ...................... hurry or we will be late for the English class.
7.You .....................eat fruit and vegetables. It is good for your health.
8.The baby is sleeping. You ...................shout.
9.You ........................ study for the test.
10.You ....................... walk on the grass.
Fill the blanks with must or mustn’t.
A: MUSTA: MUST
B: MUSTN’TB: MUSTN’T
A
B
B
A
B
A
A
B
A
B

6. HAVE TOHAVE TO
DON’T /DOESN’T
HAVE TO
DON’T /DOESN’T
HAVE TO
Students HAVE TO wear
uniform in Peru. It’s January. We DON’T HAVE TO
go to school.
It’s January. We NEEDN’T go to
school.
Obligation
Unnecessity

7. Match These
1. A doctor
2. A teacher
3. A taxi driver
4. A baker
5. A father
a.has to earn money for his
family.
b.has to be very careful on
the roads.
c.has to help his patients.
d.has to make bread for his
customers.
e.has to come to classes on
time.

8. Match These
1. Alicia’s father is extremely rich so …
2. Lucy feels terribly tired so …
3. Berkan always watches TV at nights so …
4. Mehmet doesn’t like his deskmate so …
a.he has to spend time for his lessons.
b.he has to change his place.
c.she doesn’t have to work anywhere.
d.I think she has to go home and rest.
c
d
a
b

9. 1. John has got an easy job. He ___________ work
very hard.
2. Why is Susan waiting? She _____________ wait.
3. Keep these papers in a safe place. You _______ lose them.
4. We _______ forget to turn off the lights before we leave.
5. We have a lot of time. We ____________ hurry.
6. It’s Lisa’s birthday next week. I ______ forget to buy her a
present.
don’t have to
mustn’t
mustn’t
mustn’tmustn’t
doesn’t have to
doesn’t have to
MUSTN’T / DON’T – DOESN’T HAVE TO

10. 1. John has got an easy job. He ___________ work
very hard.
2. Why is Susan waiting? She _____________ wait.
3. Keep these papers in a safe place. You _______ lose them.
4. We _______ forget to turn off the lights before we leave.
5. We have a lot of time. We ____________ hurry.
6. It’s Lisa’s birthday next week. I ______ forget to buy her a
present.
don’t have to
mustn’t
mustn’t
mustn’tmustn’t
doesn’t have to
doesn’t have to
MUSTN’T / DON’T – DOESN’T HAVE TO