Modal verbs may, might, can, must, have to

2. 
Modal verbs are used to modify
other verbs and to express if an
action is recommended,
possible, obligatory, prohibited,
etc.

3. 
These modal verbs are used to talk about a possibility in the
future.
A: What are your plans for tomorrow?
B: I’m not sure. I might/may visit* my grandparents.
* Base form verb.

4. 
You can use may and might in a
negative form by writing not
after the modal verb.
 Lisa may not / might not go
to the concert. She doesn’t
have tickets yet.
 We may not / might not cook
this weekend.

5. 
An additional use of may is to
give or ask for permission (in a
formal way).
May I sit here?
You may have a cookie when
you finish your lunch.
 You may not watch TV. You
didn’t clean up your room.

6. 
These modal verbs have the same
form for all the pronouns.
Use a base form verb after modal
verbs.
May and might are never contracted.

7. 
We often use have to to say that something is
obligatory.
e.g.
Children have to go to school.

8. 
Affirmative I have to wear a uniform to school .
Susan has to clean her room.
Questions Do you have to work on weekends?
Yes, I do/No , I don’t
Does Jack have to wear a suit at work?
Yes, he does/No, he doesn’t

9. 
We use it to express that there is no obligation or
that something is not necessary.
e.g.
I don't have to work on Sundays.
You don't have to eat anything you don't like.
Mike doesn’t have to take the kids to school.

10. 
We use it to express
obligation or duty. This also
refers to laws and regulations.
e.g.
I must learn all of these rules
about modal verbs.
People must turn off their cell
phones before the movie starts.

11. 
Use a base form verb after must.
Affirmative You must wear a
seatbelt at all times .

12. These modal verbs are
used to express
prohibition.

13. 
I mustn't forget my keys.
You mustn't disturb him.
Students must not be late.
I can’t be late for class.
You can’t use your phone in
class.
Students cannot drink alcohol around
the building.

14. 

15. 