2. 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 o
n himself or others.

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

4. You must fill out the form to work
Must VSF Complement
Subject

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

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

7. (Interrogative)
Must she take this medicine ?
Must VSF complement ?
Subject

8. Must we leave now ?
Must VSF complement ?
Subject

10. 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.

11. (Affirmative)
Clara has to work on saturdays.
Have/Has to VBF Complement
subject

12. You have to drive on the right
have/has to VBF complement
Subject

13. (Negative)
You don’t have to read this book
Do/Does+Not=
Don’t / Doesn’t Have to VBF Complement
Subject

14. We don’t have to come after 12
Do/ Does+not= Have to VBF COMPLEMENT
Don’t Doesn’t
Subject

15. (Interrogative)
Does Ben have to finish the proyect tomorrow ?
Do/ Does
Subject
Have to
VBF Complement
?

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