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CAN – TO BE ABLE TO
I can drive. = I am able to drive.
Can
"Can" is Es uno de los ´´modal verbs´´ mas comunes y utilizados. Puede ser utilizado para expresar habilidades y oportunidades, parapedir u ofrecer permisos,y para mostrar posibilidades o imposibilidades.
Examples:
* I can ride a horse. ability
* We can stay with my brother when we are in Paris. opportunity
*She cannot stay out after 10 PM. permission
* Can you hand me the stapler? request
* Any child can grow up to be president. possibilityMAY – BE ALLOWED TO
I may go out – I am allowed to go out
May
"May" es mas comun para expresar posibilidades. También se puede utilizar para dar o solicitar permiso, aunque esteuso es cada vez menos común.
Examples:
* Cheryl may be at home, or perhaps at work. possibility
* Johnny, you may leave the table when you have finished your dinner. give permission
*May I use your bathroom? request permission

Could
"Could" es usado para expresar posibilidad o capacidad pasada, así como hacer sugerencias y peticiones. "Could" usualmente es tambien usado enoraciones condicionales como un condicional de la forma "can."
Examples:
* Extreme rain could cause the river to flood the city. possibility
* Nancy could ski like a pro by the age of 11. pastability
* You could see a movie or go out to dinner. suggestion
* Could I use your computer to email my boss? request
* We could go on the trip if I didn't have to work this weekend. conditionalExercises
1 They (can/might)  be away for the weekend but I'm not sure.

2 You (may/might)  leave now if you wish.

3 (Could/May)  you open the window a bit, please?

4 He (can/could)  beFrench, judging by his accent.

5 (May/Can)  you play the piano?

6 Listen, please. You (may not/might not)  speak during this exam.

7 They (can't/may not)  still be out!

8 You...