EXPOSITION IN CLASS

MUSTN'T

Must is a modal verb, the modal verbs in English are verbs that use for express different functions, for example obligation, skill, reviews, etc.

NOTE: The must utility others verbs.   

Mustn´t is conformed:

subject + must´n + infinitive verb

Example:

I mustn´t be late for work.

Mustn´t is utility for prohibition of thing that should not do.

Example:

You mustn´t be late.

Mustn´t hasn´t the same significant that don´t have to