情态动词复习要点1
can , could 能,会( could 可以看作是 can 的过去式,这两个词除了时态不相同外,在表达意思的许多方面是相同的
当然 could 也有自己独特的用法
)1 )表示脑力或体力上的能力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
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
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 4 )(用于否定句、疑问句或感叹句中)表示猜测、怀疑或惊诧How can / could you be here
你怎么会在这儿
She couldn't / can't be so stupid to do that
她不可能蠢得去做那种事吧
Where could / can the boy be now
那孩子现在能在哪儿另外, cou