BASIC-GRAMMAR-U-10.1

10.1.

must/mustn’t

Bella :	Bye, Dad.
Dad :	Bye, Bella. And don’t forget
	– you must be home by ten-thirty.
Bella :	What? Ten-thirty? You’re joking!
Dad :	No, I’m not. You mustn’t be late.
	Bye, Bella.
Bella :	But…

PRESENTATION

Use must and mustn’t to talk about obligation and prohibition.

Affirmative and negative

I / You / He / She / It / We / They	must	be home at ten.
	mustn’t

Must and mustn’t are modal verbs. This means:

♦ No third person s

Say He must go. (don’t say ~~He musts go.~~)

♦ No past tense

(don’t say ~~I musted go.~~)

♦ No auxiliary do

Say I mustn’t go. (don’t say ~~I don’t must go.~~)

♦ No to before the verb

Say They must go. (don’t say ~~They must to go.~~)

EXERCISES⇒