be able to do 什么时候表示成功做某事

显示全部楼层 · 2011-11-26 22:49:26

(1) be able to 强调通过努力而获得的能力，而can则强调自身已具有的能力。如： She can sing the song in English. 她能用英语唱这首歌。 He will be able to sing this song in English in a few minutes, too. 几小时之后，他也能用英语唱这首歌。 (2) be able to 强调一种结果，而can只强调一种可能。如： Luckily, he was able to escape from the big fire in the end. 幸运的是，他终于逃出了大火。 If he got here a few hour...

千问 · 2011-11-26 22:49:26

用于过去时中表示成功做某事。如：Though the fire was fierce, they were able to escape the burning building. 尽管火势很猛，他们还是成脱离了烧着的大楼。...