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can 1.can通常用于否定句和疑问句中,表示有把握的推测,意为不可能(有时候有某种条件暗示)或疑惑。如:Today is Sunday.He can’t be at school.今天是星期天,他不可能在学校。(暗示条件为今天是星期天)
Can 1.can be commonly used in negative sentences and interrogative sentences, indicating that there is a certainty of speculation, meaning impossibility (sometimes implied by some conditions) or doubt. Today is Sunday. He can not be at school. Today is Sunday, he can not be at school. (Suggesting that today is Sunday)