couldn't与can't的用法区别是什么？

Answer 1

在请求语句里面couldn't比can't较委婉

在一般语句里面couldn't表过去时can't表现在时

拓展资料：

can't

1、I'm afraid I can't remember the way

我恐怕不记得路了。

2、I don't want to leave, but I can't go on.

我不想离开，但我继续不下去了。

3、I can't drink any more.

我不能再喝了。

4、Don't tell me you can't remember.

不要告诉我你记不起来了。

5、I can't eat any more; I'm full up.

我不能再吃了，我已经很饱了。

couldn't

1、Jamie e-mailed me to say he couldn't come

杰米给我发了电子邮件，说他不能来了。

2、I couldn't tell if he had been in a fight or had just fallen down

我不知道他是和人家打架了，还是仅仅摔了一跤。

3、I couldn't imagine why he would want to be alone with me

我想象不出为什么他会想和我独处。

4、They put a screen in front of me so I couldn't see what was going on.

他们在我面前竖了一面屏风，所以我看不到发生了什么事情。

5、I couldn't get back to sleep.

我再也睡不着了。