must/ mustn't/ don't have to
www.sites.google.com/site/neworks2030
Obligation
|
Prohibition
|
No obligation
|
|
I / you
|
Must
|
Mustn’t
|
Don’t have to
|
He/ she/ it
|
Must
|
Mustn’t
|
Doesn’t have to
|
We/ you/ they
|
Must
|
Mustn’t
|
Don’t have to
|
a.
Use:
I must go to school →
correct
I must to go school →
not correct
She
mustn’t smoke →
correct
She mustn't to smoke →
not correct
She doesn't have to go to school today
b.
Meaning:
meaning
|
|
must
|
You are obliged to do something/it is
necessary → obligation
|
Mustn’t
|
There is no choice/ you are prohibited from
doing something
→ prohibition
|
Don’t have to
|
There is a choice/ you have options/ you can
do something, but you are not obliged to do it
|
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