The boat capsized quite near the bank so the children were able to swim to safety.
船是在离岸很近处翻的,因此,那些孩子能够游到安全的地方。(他们能够也的确游到安全的地方。)
但是,这一规则用于否定句中表示未能发生的事时或与表示感觉的动词连用时,就不那么严格了:
He read the message but he couldnt/wasnt able to understand it.
他读了那张纸条,但却不懂是什么意思。
I could/was able to see him through the window.
我透过窗户能看见他。
D 过去完成式是 had been able:
He said he had lost his passport and hadnt been able to leave the country.
【牛津实用英语语法:137 can/am able,could/was able】相关文章:
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2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29