UNIT II -- MODAL VERB "MUST"

 

MODAL VERBS "MUST" 

"Must" is a modal auxiliary. It is mainly used to indicate an obligation or prohibition ("must do something" or "must not do something").

As an auxiliary verb, it shares the characteristics of modals:

- It is followed by an infinitive verb without "to", except be able to, need to, have to and ought to.

- The third person singular does not have -s in the present simple.

- You do not need to add the auxiliary do/does for the interrogative and negative form.

- It does not have compound or progressive tenses.

- It does not have an infinitive.

Affirmative Interrogative:

-must

 Negative Form:

-must not

Negative short:

-mustn`t