Must is a modal auxiliary verb. In one of its meanings, it is used to give strong advice or orders (to oneself or to other people).
Affirmative
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|
must
|
go
come
work
live
speak
| |
Mustn't means that it is neccesary that you do not do something.In other words, it is used to tell people not to do things.
Negative
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|
must not
mustn't
|
go
come
work
live
speak
| |
We use the questions with must to ask about the intentions of wishes of the person one is speaking to.
Interrogative
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Must
|
|
go?
come?
work?
live?
speak?
| |
Affirmative answers
|
Negative answers
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Yes,
|
I
you
he
she
it
we
you
they
|
must.
|
No,
|
I
you
he
she
it
we
you
they
|
mustn't.
| ||
