couldn't和can't的區(qū)別 兩者有何不同

couldn't和can't的區(qū)別：在請(qǐng)求語(yǔ)句里，couldn't比can't較委婉。在一般語(yǔ)句里，couldn't表過(guò)去時(shí)，can't表現(xiàn)在時(shí)。例句：I couldn't tell if he had been in a fight or had just fallen down.

couldn't和can't的區(qū)別

1、表示時(shí)間不同：couldn't代表的是過(guò)去的時(shí)間，表示以前某種情況不能發(fā)生或者某種行動(dòng)無(wú)法完成。例如：“I couldn't finish my homework last night”。而can't則代表的是現(xiàn)在或者將來(lái)的時(shí)間。它指的是當(dāng)前或者未來(lái)某種事情是不可能發(fā)生的。例如：“I can't play basketball”。

2、語(yǔ)氣方面不同：在請(qǐng)求語(yǔ)句里，couldn't比can't較委婉。例如：“I couldn't disagree with you more”。

can't造句

1、You can't measure it.

2、You can't edit what you can't see.

3、I can't keep quiet.

4、I can't run faster.

5、We can't forgive his impoliteness.