阿尔山旅行社哪家好:couldn't 和cann't 有什么区别

来源：百度文库 编辑：查人人中国名人网 时间：2024/05/02 07:52:31

couldn't表示有礼貌的(有时用在建议中)
另外一个就是过去式了喽.

could是can的一般过去式

且couldn't与其相对较委婉

couldn't
比较委婉 can't的过去式

couldn't
1.比较委婉2.是can't的过去式

事态不同

1时态不同 2语气不同

couldn't 和cann't 有什么区别 couldn't翻译 cann't display video mode cann t stop mp3 bt的问题求教cann't connect tracker could和 must和 couldn't 的区别和用法？ Error:loader couldn't initialize service! Error:loader couldn't initialize service! I couldn't agree more couldn't help 后面加什么？