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This document discusses the affirmative, negative, and interrogative forms of the verb "can". In the affirmative form, "can" is followed by a verb in its base form. In the negative form, "can't" is used. In the interrogative form, "can" is followed by a subject and verb. "Can" is used to ask for things, permission, discuss abilities, and inability. It is followed by a verb in its infinitive form.