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can，be able to，属于情态动词
一 can表示因为具备某些特点或者条件某人能够完成某件事，或某件事可能存在。
（1） can既表示能力也表示可能性。
例：Bob can play the piano ，he was taken lessons for many years.
John is strong.He can lift that heavy box.
The theater can seet 10000 people
注：表示有能力做某事时，一般不用，be able to。
（2）could可以作为can的过去式，表示过去有能力做某事。
注：如果不表示能力，could则不表示过去，即：不是can的过去式。
例：Our son could talk when he was two years old.
I could run fast when i was a child ，but now I can"t.
In those days few workers could support their families.
（3）could 表示过去有能力做某事，强调的是一般的能力，此时可用was/were able to 替换。
例：I could/was able to recite several poems when I was 3 years of age.
I could /was able to run fast when I was a child ，but now I can"t.
二 表示过去特定场合表现出的特定的能力，具体的能力，或是某人在某一场合设法成功地完成了某件事。
此时用was/were able to 相当于succeeded in doing /managed to do
例；With the aid of the wood ，he was able to swim across the river .
I applied everywhere and finally I was able to get a good jop.
He hurrried to the station and was able to catch the train.
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