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2ND ESO CAN



1-STRUCUTURE

   
                            Affirmative               Negative                      Interrogative ?

Present                I can swim                 I can't swim                 Can I swim

Past                     I could swim              I couldn't swim            Could I swim?

Future         I Will be able to swim    I won't be able to swim   Will I be able to swim?


*It is the same form for the persons (excepción en contextos gramaticales se puede gastar persons)
*In all the form and tenses  + CAN / COULD / WILL BE ABLE + INFINITIVE (sin preposición)

2- USE

2A To about ABILITY
I couldn't speaking English when I was Young (past)
I can speak English. I'm from the UK (present)
I won't be able to speak English when I leave school because I never do my homework (future)

2B To say what is or isn't possible in a particular situation in the past, present and future
Sorry, the doctor can't see you now, he's busy (present)
I couldn't call you last night. I'm sorry (past)
I Will be able to meet lots of new people at university (future)

*WE DON'T USE THE POSITIVE FORM OF COULD TO TALK ABOUT WHAT WAS POSSIBLE IN A PARTICULAR SITUATION IN THE PAST. INSTEAD WE USE THE PAST FORM WAS/WERE ABLE TO
I was able to buy the ticket for the concert
I could buy the ticket for the concert   IT MEANS QUE PODRÍAS O NO PODRÍAS LIKE SAYING I might/ may buy the ticket for the concert
Es decir could no se utiliza para decir que algo fue posible o no (en el pasado) sino para decir que algo puede que pase o no en el futuro

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