Necesito saber las diferencias de can - could y May - might?

Diferencia entre May, might, could Estos son los distintos significados que pueden tomar los verbos modales.

May, might y could

MAY

Expresar probabilidad : We may go out this Saturday.

Expresar deseos / esperanzas : May the force be with you.

Pedir / conceder permiso : You may now kiss the bride.

Ofrecerse : May I help you?

Expresar concesión : He may be the landlord, but he has no right to visit us whenever he wants.

Expresar prohibición : You may not take photographs in the Museum.

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MIGHT

Expresar probabilidad : Be careful, the floor might be slippery.

Hacer sugerencias : You might try parking in the street.

Pedir algo : Might I borrow some money?

Expresar reproches : You might at least have asked my opinion!

Expresar concesión : He might not look very smart, but he is actually a genius.

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COULD

Expresar una habilidad (pasado) : I could do a handstand when I was a little girl

Expresar probabilidad : They could fine you if you don’t leash the dog

Pedir algo / hacer sugerencias : Could you give me a hand?

Pedir permiso : Could I leave a bit early today?

Deducir algo : Please, pick up the phone, it could be something important!

Expresar voluntad : I couldn't possibly let you handle this situation on your own.