你好,都用could't是肯定不会错的,因为could可以是礼貌用词也可以是can的过去式.如果想要区分开来用,那就要根据问题提问的内容了.如果问句提问过去的内容,就用could'd；如果问句问的是一般现在式,就用can't
could引导的一般疑问句的否定回答是用I can't还是 I could't
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