- it's a modal: it is used to say "poder" or "saber" . It means ability / possibility / permission / impossibility / prohibition; depending on the form and the context.
- it's defective: with NO -s in the 3rd person, NO infiniteve (to be able to) and NO past participle ( been able to)
- it's auxiliary: you use it in interrogative and negative forms Can you open this? No, I can't
To practise with listening, here you have this song with CAN: http://www.youtube.com/watch?v=5lpcWqecyak
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