N3 C2 M1 - Modal verb:must, mustn´t

Modal verb

Negative sentence

Positive sentence

We use this modal verb to express obligation or duty.

Mustn't describes an action that is prohibited.

Feature: • Strong recommendation, based on the speaker's opinion or what they feel is important. • It is a modal verb that you don't need to conjugate. • It is for used singular and plural subjects. • Must isn't a main verb. • It is needed a main verb in the simple form after 'must'.

Feature: • We use mustn't for singular and plural. • We use mustn't only in the present simple. • It is needed a main verb in the simple form after 'mustn't'.

Must Mustn't

We don't often use the question form of 'must'. Must you deliver your homework on time?

- You must study for the exam or you won't pass it. - She must wear a uniform at school. - Students must behave in the classroom.

- Students mustn't smoke in the school. - You mustn't eat in the class. - I mustn't be late for class.

Negative

Interrogative

Positive

Must+ person + verb in base form + ?

Person+ must + verb in base form

Person+ must not/ mustn't + verb in base form