couldn't是can't的过去式吗couldn't的原型是can't吗?0 - 离问题结束还有 14 天 23 小时 couldn't的原型是can't吗?couldn't是过去式吗

问题描述:

couldn't是can't的过去式吗
couldn't的原型是can't吗?
0 - 离问题结束还有 14 天 23 小时
couldn't的原型是can't吗?
couldn't是过去式吗

可以这么说

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.