MODAL You use can to indicate that someone has the ability or opportunity to do something. Can you capture a screenshot of the error and send it to me? Can you give me the book? 这个用法在老外听来可是十分不礼貌的。“Can”在这里是指一种能力，这句话等于是在问你有没有把书递给我的能力，除非身体有缺陷，相信四肢健全的人都能做到这件事。 所以应该这样说才对：Could you please give me the book? 可以给我那本书吗？