be able to后面用动词原形,这是一个固定搭配,意思是“能够做某事”,用于各种时态。
双语例句
1、They may be able to help with childcare so that you can have a break.
他们可以帮忙照料孩子,这样你就可以歇一歇了。
2、If only I could get some sleep, I would be able to cope.
要是能睡上一会儿,我就能应付了。
3、If you need help at work, your Personnel Manager should be able to help.
如果你工作中需要帮助,人事经理应该能帮上忙。
can和be able to用法上的区别
区别一:强调重点不同
1、be able to 强调通过努力而获得的能力。
2、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。
区别二:强调内容不同
1、be able to强调一种结果,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。
2、can只强调一种可能,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。
区别三:时态限制不同
1、be able to 可以有各种时态。如:I could help you last night, but you didn’t come。昨天晚上我能帮你,而你又没来。
2、can只有一般现在和一般过去两种时态。如:He is / was / will be able to help you。他能帮你的忙。