can的否定形式是can't或can not。can情态动词、名词、动词，作情态动词时意为“.能；能够；有机会；可能；被允许”，作名词时意为“圆柱形金属容器；罐头；一听所装的（食物或饮料）量；酒瓶；喷罐；监狱；卫生间；臀部；驱逐舰；破坏者；（美）卡恩（人名）”；作动词时意为“把（食物）装罐保存；（非正式）解雇；拒绝接受”。例句：What can I do for you?我可以为你做些什么？What can it do for me?它可以为我做什么？

tin can.罐头；马口铁罐头；锡罐；锡杯

aluminum can.铝罐；铝包壳；铝能图片

beverage can.易拉罐；饮料罐头；饮料罐

Trinh Can.郑根

Huy Can.辉瑾

Can think.能想

Can get.能拿到

Money can.钱能；储钱罐；千金难买

can buoy.[水运]罐形浮标；罐形浮筒；罐状浮标

I can't help thinking of my happy childhood.

我禁不住想起我幸福的童年。

Parents cannot be too patient.

做父母的越有耐心越好。

He cannot help his views.

他不得不有自己的意见。

Some people say that boys cannot help it.

有人说男孩子总是要这样。

When a friend gave me a ticket,I can't help but go.

一位朋友送给我一张票，我只好去了。

1、When can I get my test results?

我什么时候可以拿到化验结果？

2、We can reduce the problem to two main issues.

我们可以将这个问题概括成两个要点。

3、You can get me on 0181 530 3906.

你找我可以拨打01815303906。

4、This could cause serious damage to the country's economy.

这可能对国家的经济造成严重破坏。

5、The operation could prolong his life by two or three years.

这次手术可使他多活两三年。

6、I'll see what I can do to help.

我考虑考虑，看我能帮上什么忙。

7、I don't know how you can say things like that.

真想不到你怎么会说出这种话来。

8、I could come next week,or the week after.

我可能下周来，或者再下一周。

9、How long can a human being go without sleep?

人不睡觉能活多久？

10、The money could be better spent on more urgent cases.

这笔钱用于较紧迫的事情也许会好些。

11、I can't see you now─some other time,maybe.

我现在不能见你——也许别的时候吧。

12、Modern farming methods can have an adverse effect on the environment.

现代农业耕作方法可能对环境造成负面影响。

13、I can't work if I'm cold.

我要是觉得冷就干不了活。

14、He might get there in time,but I can't be sure.

他有可能准时到达，但我不敢肯定。

15、You can back up another two feet or so.

你可以再退两英尺左右。