Posteado por: inglesjbosco | 8 septiembre, 2010

Must / Mustn’t

Must (subjective obligation)

We often use must to say that something is essential or necessary, for example:

  • I must go.

Structure of Must

Must is a modal auxiliary verb. It is followed by a main verb. The structure is:

subject + must + main verb

The main verb is the base verb (infinitive without “to”).

 

Structure of Must

Must is a modal auxiliary verb. It is followed by a main verb. The structure is:

subject + must + main verb

The main verb is the base verb (infinitive without “to”).

Must not, Mustn’t (prohibition)

We use must not to say that something is not permitted or allowed, for example:

  • Passengers must not talk to the driver.

Structure of Must not

Must is an auxiliary verb. It is followed by a main verb. The structure for must not is:

subject + must not + main verb

The main verb is the base verb (infinitive without “to”).

Use of Must not

Must not expresses prohibition – something that is not permitted, not allowed. The prohibition can be subjective (the speaker’s opinion) or objective (a real law or rule).

 

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