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 MODALS:
CAN, MAY, MUST, HAVE TO
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1) Ability
I can drive
2) Possibility
I can come
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1) Obligation
I must do my homework.
2) For an opinion that you think
has a good possibility of being true.
Look at his uniform. He must be a policeman.
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MAY
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HAVE TO
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1) Probability
She may come tomorrow.
2) In a very polite question
May I open the window?
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1) In the affirmative: HAVE TO
has a meaning similar to MUST.
I have to go to the school.
2) In the negative: HAVE TO has
a different meaning: "you don't need to dot that"
It's Sunday! I don't have to go to school.
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TEST
: Fill in the gaps with
CAN/CAN'T, MAY/MAY NOT, MUST/MUSTN'T, HAVE TO/DON'T HAVE TO
JOHN: "_________ you come to the match this afternoon?"
PETER: "I'm sorry. I _________ . I _________ wash my father's
car."
JOHN: "But it's raining! You _________ wash it!"
PETER: "I know, but my parents say the rain _________ stop
soon. And I _________ go out with you tonight because I _________
go to my grandmother's birthday party and I _________ come back
late."
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ANSWERS
JOHN: "CAN
you come to the match this afternoon?"
PETER: "I'm sorry. I can't . I
MUST wash my father's car."
JOHN: "But it's raining! You DON'T HAVE
TO wash it!"
PETER: "I know, but my parents say the rain MAY
stop soon. And I CAN'T go out with
you tonight because I MUST go to my
grandmother's birthday party and I MAY
come back late."
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GREAT! 
