2. May –used for probability and
permission
Present
Sue may/is allowed to come with us every weekend.
Past
Catherine might/was allowed to stay on our farm last
year.
Futuro
She may /will be allowed to come with us tomorrow.
3. Can-used for ability
Deb can /is able to play tennis.
Roger could/was able to play
tennis better six years ago.
Dan’s son will be able to play tennis much
better than his father when he grows up.
6. Must -obligation,deduction,necessity
used in the present tense only.
We use have to to make the past and future.
You must recycle.
Must I recycle? We mustn’t polute the air.
7. They must be travelling their car
isn’t in the garage.
She must lose
weigh.
8. Must –have to
We use have to to make the past and future form.
When I was a child I had to go to bed early.
I will have to work hard next year, I’m
planning to buy a new car.
ATTENTION
You don’t have to wear a uniform.
You have to wear a uniform.
You must wear a uniform
You mustn’t wear a uniform.
9.
10. 1. She should
see a dentist.
2. She shouldn’t
eat sweet.
Sandy has
got a
toothache.
11. 1. She should
eat chicken
soup.
2. She should
stay in bed.
Julia has got
flu.
12. 1. He should eat
fruit and
vegetables.
2. He should eat
healthy food.
Bill has got
a
stomachache
.
13. 1. He shouldn’t
carry heavy
things.
2. He should get
a good rest.
Bill has got
a backache.
15. Should and ought to
The verbs should and ought to are used
for advice,recomendation or moral
obligation.Although they are synonims
we use should in interrogative and
negative sentences.
16. Caracteristics
The modal verbs are used with other verbs in the
infinitive without to.
Don’t need auxiliar verbs.
We don’t use them in the gerund(ing)
They are the same for all persons.
