could, can, might, may

[huda]

hi,
what is the difference between can ,could, might, may?

in other words, are there any rules to ues them?
in fact , i don't find any difference in meaning betweem (can, could) , and so for(may, might) .
thanks in advance,
huda

[vanilla]

1- Ability--- Can-- I can speak French.
----could--- She could talk when she was a year old.

2- possibility--- may---- He may be sick. (present)
----may have---- She may have saved enough money.(past)
------might -------I might go to the play; I'm not sure. (present)
------might have----- The money might have been stolen. ( past)
-----could----- Frank could be on his way. (present)
------could have -------They could have taken the wrong road. (past)
I hope these sentences can help you.

[huda]

thank you,
i understand from your reply that can and could are used for ability in present time ,but in case could have will be in past.
right?
if so,does that means that I can use both in case of ability in present ?

regarding, may and might for possibility in present time too, and the same thing in case of have.
does that means that I can use both in case of possibility in present?

[Mya Adam]

THANX ALOT