She tired and was able to work it out.
Be able to 和 can在表示“能力”时可以换用；当 be able to 表示经过努力或克服了困难之后做成了某事时便不能与 could 换用，却能与 managed to 或“succeeded in+动名词”换用。 例如：
Then he spoke slowly, but I could not understand him。
后来，他说话说得慢了，但是我还是听不懂他的话。
本句中的 could not 可以换用 was not able to。
Tazief was able to set up his camp very close to the volcano w...全部
Be able to 和 can在表示“能力”时可以换用；当 be able to 表示经过努力或克服了困难之后做成了某事时便不能与 could 换用，却能与 managed to 或“succeeded in+动名词”换用。
例如：
Then he spoke slowly, but I could not understand him。
后来，他说话说得慢了，但是我还是听不懂他的话。
本句中的 could not 可以换用 was not able to。
Tazief was able to set up his camp very close to the volcano while it was erupting violently。
泰哲夫在火山猛烈爆发的时候，终于设法在离火山很近的地方搭起了帐蓬。
本句中的 was able to 不可以换用 could, 但是可以换用 managed to。
She tried and was able to work it out。
她试了，能把它算出来（解决）。
（你打错了吧？tired应为tried）。收起
