couldn't是can't的过去式吗
问题描述:
couldn't是can't的过去式吗
couldn't的原型是can't吗?
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couldn't的原型是can't吗?
couldn't是过去式吗
答
couldn't可以是can't的过去式,也可以单独用.单独用时意思与can't差不多,但语气更委婉一些.