must/ mustn't/ don't have to
|
|
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
|
