1. MMustn’tustn’t
oror
DDon’t haveon’t have
to?to?

2. MUST + NOTMUST + NOT
(negative form)(negative form)
MUSTN’TMUSTN’T
Mustn’tMustn’t is used to say that something is not allowedis used to say that something is not allowed

3. DoDo
Does + NOTDoes + NOT ++
have tohave to
DidDid
Don’t have toDon’t have to is used to say that is notis used to say that is not necessarynecessary
to do sth …to do sth …
DON’T HAVEDON’T HAVE
TOTO

4. EExamplesxamples::
• You _____________ tidy your
room. I tidied it this morning.
Don’t have to
• Be quiet! You _________ talk in
the library.
Mustn’t