I can do anything,but I couldn't do everything.为什么后半句can要变成c

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/05 16:23:09

I can do anything,but I couldn't do everything.为什么后半句can要变成couldn't

虚拟语气,用could是委婉说,不是所有的事情都我一个人做,cann't的话,意思就变为什么事都不做.
再问： couldn't 不是can't的过去式吗？在句子里用couldn't不就说明这是一般过去时吗？
再答： can will may 等情态动词过去式could would might 本身也是情态动词，大部分动词的过去式也做为虚拟语气时的动作表达，至于是在讲过去还是委婉陈述，看说话者在说什么

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