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Obligation, Prohibition and Absence of Obligation

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Obligation, Prohibition and Absence of Obligation

RULES PRACTICE
MUST/HAVE TO AT THE ZOO

HAVE TO and MUST mean it’s Children _______ 1 be supervised.


necessary to do something. In Visitors ________ 2feed the animals.
American English have to is If you see a person in immediate danger, you _____ 3
more common. Often it doesn’t contact Zoo staff immediately.
matter which one is used: You ________________4 to pay for a ticket if you’re
I must/have to leave now. under six years old.

MUST
AT SCHOOL
Sometimes MUST is about Students ___________ 5 to wear uniforms, but they
personal obligation. The speaker ___________ 6 respect the property and equipment
feels it’s necessary for him or of the school and others.
his listener to do something. Every student _______7 be serious, honest,
You must stop offering me these responsible, polite and neat in appearance.
cookies. In Japan, students _________8 forget to sweep the
hall floors before they go home at the end of the day.
DON’T NEED TO/
DON’T HAVE TO
TRAFFIC RULES
DON’T/DOESN’T NEED TO...
means it’s not necessary to do You _______ 9 stop when the traffic light is red.
something. You ______10 turn right. Look at the sign!
You don’t need to hurry to cross Traffic wardens _________ 11 be patient but firm
the street. There’s plenty of with negligent drivers.
time. Cyclists ___________12cycle on the pavement.
In England you _________13 drive on the left.
MUSTN’T

MUSTN’T means it is CAMPING RULES


ABSOLUTELY necessary NOT TO
DO something. Trees _________ 14 be cut down, nor wood removed
You mustn’t cross the road. from live trees.
You must wait for the green light. All fires ______ 15 be within the built fireplaces.
Water is metered and _____ 16 be paid for, so you
HAVE TO _____ 17 ensure all taps are turned off after use.

HAVE TO is sometimes used to


describe an obligation that comes BABYSITTING
from ‘outside’.
Your doctor says you have to A babysitter _____ 18 know that she/he _______ 19
stop smoking. open the door if someone he/she doesn’t know wants
to come in. If the person doesn’t go away, he’ll/she’ll
SOURCES: ____________20 call the police.
Murphy R. English Grammar in
Use. C.U.P. 1999
1. must /have to

2. mustn’t

3. must/have to

4. don’t need t/don’t have

5. don’t need/don’t have

6. must/have to

7. must/has to

8. mustn’t

9. must/have to

10. mustn’t

11. must/have to

12. mustn’t

13. must/have to

14. mustn’t

15. must/have to

16. must/has to

17. must/have to

18. must/has to

19. mustn’t

20. have to

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