CAN, COULD, MAY AND MIGHT

For permission

Can I play some music?

For request or suggestions

Can I have the bill?

For abillity

I can dance Tango

Past ability

I could see that Danny was angry

For permission

You could sit here if you like

For possibility

Could this really be true?

For formal permission

May I come in?

To suggest a posibility

They may be late

For possibility

Peter might come to the party