Nobody can stop the development of science .
谁也无法阻止科学的发展。
She can sing that song in English.她能用英文唱那歌。
He can submerge to a depth of about twenty meters .
他能潜入约二十米深的水中。
He could hardly support his family before he found the new job .他在找到那份新工作前几乎无 法养家。
I could not understand the lecture on the computer given by Mr. Smith .
我听不懂史密斯先生作的那个关于计算机的讲座。
2)表示客观上的可能性
You can borrow this useful book from the library .
你可以从图书馆借到这种有用的书。
A more suitable person than him for the job can not be found . 不可能找到比他更适合这份工作的人了。
Now people can skate on the lake .现在人们可以在湖上滑冰了。
When the storm stopped , the plane could take off .
当风暴停下来时,飞机可以起飞了不得。
3)表示主观上的允许
Can I ask you some questions about it ?
我可以问你有关这件事的几个问题吗?
You can not leave here till I come back .直到我回来你才能离开。
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