be able to的用法有哪些
扩展资料
be able to的含义及用法
be able to意为（因具有品质或技能）能做到…的;（因有足够的.自由、权力、时间、财力等而）可以…的，能够…的。
1、be able to是指通过努力而获得的能力，强调一种结果。
例句：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。
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 hours earlier, I could save him.
要是他早几小时来，我还能救他。
2、be able to可以有各种时态，后面只接不定式的主动形式，不接表示被动的不定式,也不可用无生命的名词作主语。
例句：I could help you last night, but you didn’t come.
昨天晚上我能帮你，而你又没来。
Can you see it there?
你能看见它在那儿吗？
He will be able to help you.
他能帮你的忙。
The DVD can be rented from your local store.
这DVD可在你们当地的商店租借。
You’ll be able to get a taxi outside the station.
在车站外可搭乘出租车。
I haven’t been able to get much work done today.
我今天未能干多少工作。
