Must

We use must:-In the affirmative and interrogative form to express obligation in the present or future.

-In the negative form to express prohibition

NOTE : Must express an obligation which the speaker imposes on himself or others.

(Affirmative) I must go to bed early tonight. Must VSF Complement

Subject

You must fill out the form to work Must VSF Complement

Subject

(Negattive) You mustn’t cross the street when the light is red. mustn’t VSF Complement

Subject

You mustn’t touch that, is very hot! mustn’t VSF Complement

Subject

(Interrogative)

Must she take this medicine ? Must VSF complement ?

Subject

Must we leave now ? Must VSF complement ?

Subject

HAVE TO

We use have to:-In the affirmative and interrogative form to

express obligation in the present or future .-In the negative form to express absence of

obligation .NOTE: Have to express an obligation that is

imposed by someone or something else.

(Affirmative)

Clara has to work on saturdays.

subject

Have/Has to VBF Complement

You have to drive on the right have/has to VBF complement

Subject

(Negative) You don’t have to read this book

Do/Does+Not=Don’t / Doesn’t

Have to VBF Complement

Subject

We don’t have to come after 12 Have to VBF COMPLEMENT

Subject

Do/ Does+not= Don’t Doesn’t

(Interrogative)

Does Ben have to finish the proyect tomorrow ? Do/ Does

Subject

Have to VBF Complement ?

Do we have to be there at 5 o'oclock Do/don’t have to VBF Complement

Subject