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7.can与be able to
(1)can只用于一般现在时和一般过去时(could),be able to可用于更多时态中。
(2)can只表示具备了某种能力,但不一定做了,而be able to指过去某时设法做成了某事,was/were able to do相当于managed to do或succeeded in doing.
I talked with her for a long time, and eventually I was able to make her believe me.
我跟她谈了很久,最终还是使她相信了我的话。
My father could speak English.我父亲会说英语。
(3)在否定句中或与感官动词连用时,could与was/were able to可通用。
I could/was able to see them through the window.
透过窗子我能看到它们。
I wasn't able to/couldn't catch the last train.
我没能赶上最后一列火车。