Have to, don't have to, must, mustn't

ADULTS IV UNIT 5C
have to, don’t have to, must, mustn’t

MUST / MUSTN’T
+ She must tidy her room before she goes out.
- You mustn’t smoke in class
Use must+infinitive to talk about rules and obligations.
Use mustn’t+infinitive to say something is prohibited.

HAVE TO / DON’T HAVE TO
+ She has to get up at 7.oo everyday.
- He doesn’t have to work on Saturdays.
Use have to+infinitive to talk about rules and obligations,
or to say something is necessary.
Use don’t have to+infinitive to say there is no obligation,
or something is not necessary.

1) Don’t contract have or has.
I have to go. NOT I’ve to go.
2) Must and have are very similar, but there is a
small difference. We normally use have to for a
general obligation (a rule at work). We normally
use must when the speaker imposes the
obligation.

Choose the correct option
You ….. smoke in this room.
A) Must
B) Mustn’t
C) don’t have to

I …. do my homework.
A) Must
B) Have to
C) don’t have to

We …. be quiet.
A) Must
B) mustn’t
C) don’t have to

You …. make noise in this area.
A) Must
B) mustn’t
C) don’t have to

You …. put the rubbish into the bin.
A) Must
B) mustn’t
C) don’t have to

You …. Take photos in this museum.
A) Have to
B) mustn’t
C) don’t have to

You …. speak on the phone on an
aeroplane.
A) Have to
B) mustn’t
C) don’t have to

You …. swim in this river. It’s
dangerous.
A) Have to
B) mustn’t
C) don’t have to

The traffic light is red. You …. stop!
A) Have to
B) must
C) don’t have to

MODIFIERS
 (They modify the adjective).
Learning Chinese is
incredibly difficult!

Have to, don't have to, must, mustn't

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