This document provides information about the auxiliary verbs can, have to, should, and don't have to in English. It discusses their uses for expressing ability, permission, obligation, advice, and opinions. Examples are given for their structures and forms in affirmative, negative and interrogative sentences. Exercises are included to practice using these modal auxiliary verbs in different contexts.

1. Álbum de fotografías
por Anabel
Future probability
Mrs. Anabel Montes - English teacher

2. CAN:
 Can is an auxiliary verb, a modal
auxiliary verb. We use can to:
 Talk about possibility and ability
 Make requests
 Ask for or give permission

3. Structure of can
The basic structure for can is:
subject + auxiliary
verb
can
+ main verb

4. Forms
+ I can play tennis.
- He cannot play tennis.
can't
? Can you play tennis?

5. Expressing permission
We also use can /can’t to ask for
and give permission.
Example:

6. REQUESTS
And we use “can” to ask
somebody to do something!
-Can you …….., please?
Example:

7. HAVE TO :
We often use have to to say that
something is obligatory, for
example:
•Children have to go to school.

8. STRUCTURE
subject
auxiliar
y verb
main
verb
have
to-infinitive
+ She has to work.
- I do not have to see the
doctor.
? Did you have to go to
school?

9. It is NOT necessary / there is no
obligation
You don’t have to call him today. You
can do it tomorrow if you like.
DON’T HAVE TO

10. Is a normal present simple verb. For
questions forms , we use do/does +
subject + have to + infinitive without
to.
 Does he have to get more work early
tomorrow?
HAVE TO

11. Should
is a modal auxiliary that we use
very frequently in English:
To give advice or a
recommendation:
Example:
That new restaurant
downtown is great! You
should try it.

12. We also use should . . .
To give our opinion about
something.
To say what we think is a
good idea or the “right” thing
to, do in our opinion.

13. *Should is not as strong as
“must” or “have to”
Consider these examples . . .
You should stop smoking.
(=it would be a good idea; this is my
suggestion.)
You must stop smoking.
(=it is necessary that you stop.
You have to do it.)

14. a) Every man__________________do
military service in my country. It's
obligatory.
b) When do we__________________pay
for the next term?
c) Does Susan__________________work
long hours?
EXERCISES
1. Complete using HAVE TO /DON’T
HAVE TO:

15. d) I__________________get up
early on Sundays. I can stay in
bed.
e) You__________________have a
visa to come to Ukraine.
f) Every
man__________________do
military service in my country.
It's obligatory.

16. 1. He_____work in the evening.
2. We________go shopping.
3. The friends______get up early.
4. Mandy__________read the
instructions.
5. I____________play the guitar.
2. Complete using DOESN’T HAVE TO
/DON’T HAVE TO:

17. a) you can play the violin?
b) draw they can't well.
c) play I basketball can.
d) we can come house to your?
e) she sleep can't
f) you cook can?
g) watch can television I?
3. Order:

18. You should take some medicine.
You _______ get some rest.
You _______ drink some orange juice.
You shouldn’t go to work.
You _______ go out in the cold.
You _______ eat too much junk food.
Should I call the doctor? Yes, you should.
______ I get some rest? Yes, you should.
Should I go out in the rain? No, you ______.
4. Fill in the blanks