“could”是什么意思？它是怎么用的？

“could”是什么意思？它是怎么用的？

could
KK: []
DJ: []
v.aux.
1. can的过去式
She could play the violin when she was five.
她五岁时便能拉小提琴了。
2. (用于虚拟语气,表示与事实相反的设想)能,可以
I wish I could go to France.
但愿我能去法国。
I would go if I could.
能去我就去。
3. (表示可能性)可能
That could be my train.
那可能是我要乘的火车。
4. (用于婉转语气)能,可以
Could I smoke here?
我可以在这里抽烟吗?
Couldn't you try it again?
你可否再试一下??

could [kud, kəd] aux.v. (表示允准) Could I use your phone? 让我用一下你的电话好吗? (表示请求) Could I come round next week? 我下星期来拜访好吗? (表示结果) He studied very hard but couldn't pass his examination. 他学习很努力, 但没能考及格。 (表示可能性) It could be my mother. 可能是我母亲。 (表示建议) We could write a letter to the headmaster. 我们不妨给校长写封信。