Modals of obligation

1.

Modals
of obligation
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2.

You must
stop
at a red light.
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3.

You have to be over 18
to see the film.
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18

4.

You mustn’t
take photos.
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5.

You don’t
have to pay
to enter the museum.
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6.

He should
go to the hospital.
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7.

draw on the wall.
He should n’t
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8.

Can you remember the rules?
Use must and have to to say ‘this is necessary’:
You must / have to stop at the red light.
Use don’t have to to say ‘this isn’t necessary’:
You don’t have to go to school on Sundays.
Use mustn’t to say ‘don’t do this’:
You mustn’t walk on the grass.
Use should to say ‘it’s a good idea’:
You should go to the doctor.
Use shouldn’t to say ‘it’s not a good idea’:
You shouldn’t go to bed late.
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9.

Speaking
Work in groups. You will read cards and decide what to do.
Youhave
invent
a house
robot.
We don’t
to do
anything.
The robot
The
robothome.
helps Go
youtoand
your
will come
Card
1.
family around the house.
We have
find
thewake
robot!
to the
Card 2.
Oneto
day
you
upGo
and
robot is not at home!
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10.

Speaking
Discuss the options in groups and choose. Then talk as a class and move onto
the next card.
Well, I think we have to …
I think we should …
We mustn’t … , because …
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11.

Acknowledgements
The publishers are grateful to the following for permission to reproduce copyright
photographs and material:
Slide 4: ©Duygun VURALI/iStock/360/Getty Images
The publishers are grateful to the following illustrators:
Slide 6: ©David Semple; Slide 7: ©David Semple
© Cambridge University Press 2015