be able to 後跟動詞原形，表示具體的能力，與can意思相近。
I am not able to /can't answer your question.
我回答不了你的問題。
Are you able to type?
你會打字嗎？
He wasn't able to /couldn't understand the true meaning of life.
他當時不能理解生活的真正意義。
was/were able to的用法
was/were able to 表示過去成功的做了某事，相當於managed to do sth.或succeeded in doing sth.
The maths problem was hard but I was able to work it out .
這道數學題雖然難，但我把它做出來了。
The traffic was heavy,but I was still able to get home on time .
交通擁擠，但我依然按時到家了。
be able to 的其它用法
Will you be able to come tomorrow ?
你明天能來嗎？
I'm sorry I haven't been able to answer your letter in time .
真不好意思，我沒能及時給你回信。
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