can't与couldn't 的用法

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/16 08:56:02

can't与couldn't 的用法
I can't give you anything
I couldn't give you anything
那句是对的啊这两句意思有不同吗?

couldn't 是can`t的过去式和虚拟式.
在实际应用中,could`t是can`t的礼貌用法,加上有虚拟的含义,所以语气也没有那么强烈.
表示否定的话,can't比couldn't的否定意味更加重一点.
肯定的话,could当然比can要委婉啦.
所以,I can't give you anything.比I couldn't give you anything.更好些~

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