be able to

be able to    能，能够

【例句】 

◆ By the time he was 10，he was able to play the piano．10岁的时候，他就能弹钢琴了。       

◆ I knew l would not be able to hold it for long．我知道我支撑不了多久。（北京 高考）

【联想】  同义短语：be capable of

【微测】  I can carry more than one thing now. I'm ____to hold two grocery bags and help my mom carry them.                             

[able]