“Can” questions are a type of grammatical construction in the English language that are used to ask about someone’s ability or possibility to do something. They are formed by using the modal verb “can” and adding the subject of the sentence and the main verb. For example: “Can you swim?”, “Can I borrow your pen?”, “Can they come to the party?”. These questions are asking about someone’s ability or possibility to do something. Can is used to ask for permission or to talk about a general ability.