can加原形助词 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?