MAY and MIGHT

1. MAY expresses :

a. Permission
b. Possibility

2. MIGHT expresses :

a. Possibility
MIGHT can replace MAY only when MAY is used to express possibility :
It may rain today.
It might rain today

MAY and MIGHT used to express possibility never take the negative form.

Affirmative form:

She may go to the cinema.
They might go to the cinema.

Negative form:

She may not go to the cinema.
They might not go to the cinema.

Interrogative form:(N.B. Permission only)

May I go to the cinema?
May I leave now?

MAY for PERMISSION  Examples:

a. May I watch television tonight ? Yes, you may.
b. May I leave work at 16.00hrs ? No, you may not.

Note : Here 'may' has the same function as 'can':
Can I help you?
May I help you?

B.MAY and MIGHT for POSSIBILITY Examples :

a. We may go to dinner tonight, I'm not sure.
b. We might go to dinner tonight, I'm not sure.
c. It may snow tomorrow.
d. It might snow tomorrow.
e. He may not go to Spain this year.
f. He might not go to Spain this year.

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