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MODAL
(表示某事物的特点)能够，可以
You use can when you are mentioning a quality or fact about something which people may make use of if they want to.
例句
Pork is also the most versatile of meats. It can be roasted whole or in pieces...
在肉类中,猪肉的做法也是最多的,可以整块烤来吃,也可以切片烤来吃。
Luckily, iron can be reworked and mistakes don't have to be thrown away...
所幸的是,铁可以再加工,次品、废品不必被扔掉。
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MODAL
(表示有能力或机会)能，会，可以
You use can to indicate that someone has the ability or opportunity to do something.
例句
Don't worry yourself about me, I can take care of myself...
你别担心我,我能照顾好自己。
I can't give you details because I don't actually have any details...
我没办法给你提供细节,因为我并不了解任何细节。
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MODAL
(用于否定句，表示情况不允许)不能，无法
You use cannot to indicate that someone is not able to do something because circumstances make it impossible for them to do it.
例句
People who can't afford to go to the theatre or concerts can afford to go to football matches...
看不起电影或听不起音乐会的人可以去观看足球赛。
We cannot buy food, clothes and pay for rent and utilities on $20 a week...
一个星期才20美元,不够我们吃穿、付房租及水电等费用的。
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MODAL
有可能;有时会
You use can to indicate that something is true sometimes or is true in some circumstances.
例句
...long-term therapy that can last five years or more...
有可能持续5年乃至更长时间的长期治疗。
A vacant lot or a bombsite can, to the amateur naturalist, produce an extraordinary variety of flora and fauna...
对于业余博物学者来说,在一片空地上或被炸后的废墟里可能发现种类繁多的植物群和动物群。
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MODAL
(用于否定句，表示确信某事不真实或不会发生)不可能，不会
You use cannot and can't to state that you are certain that something is not the case or will not happen.
例句
From her knowledge of Douglas's habits, she feels sure that the attacker can't have been Douglas...
根据她对道格拉斯习性的了解,她敢断定他不可能是那个袭击者。
Things can't be that bad...
情况不会糟到那个地步。
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MODAL
(表示允许)可以
You use can to indicate that someone is allowed to do something. You use cannot or can't to indicate that someone is not allowed to do something.
例句
You must buy the credit life insurance before you can buy the disability insurance...
你必须先购买信用人寿保险,方可购买伤残保险。
No-one can set up a waste disposal company unless they can show that they've got enough money and trained staff to do the job properly...
任何人若想成立废品处理公司,必须证明其拥有足够资金和受训员工以保证工作可以顺利开展。
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MODAL
不行;不能;不该
You use cannot or can't when you think it is very important that something should not happen or that someone should not do something.
例句
It is an intolerable situation and it can't be allowed to go on...
这种情况忍无可忍,不能再任其继续下去了。
The Commission can't demand from Sweden more than it demands from its own members.
委员会对瑞典的要求不能比对自己的会员国要求都多。
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MODAL
(通常用于疑问句，表示建议或提议帮忙)能
You use can, usually in questions, in order to make suggestions or to offer to do something.
例句
What can I do around here?...
我在这儿能做点儿什么?
This old lady was struggling out of the train and I said, 'Oh, can I help you?'...
我看见这位老太太正颤巍巍地下火车,就问:“嗯,我来帮您一把吗?”
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MODAL
(用于疑问句时,can 表示礼貌的请求，而 can't 表示强烈请求）
You use can in questions in order to make polite requests. You use can't in questions in order to request strongly that someone does something.
例句
Can I have a look at that?...
我能不能看一眼那个?
Can you please help?...
请你帮个忙好吗?
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MODAL
(用于有礼貌地打断,或引导要说的话)能,可以
You use can as a polite way of interrupting someone or of introducing what you are going to say next.
例句
Can I interrupt you just for a minute?...
我能不能打断你们一下?
But if I can interrupt, Joe, I don't think anybody here is personally blaming you...
对不起,乔,我插一句,可我认为在座的没有谁在埋怨你。
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MODAL
(与 imagine, think, believe 等动词连用,用来加强语气)能
You use can with verbs such as 'imagine', 'think', and 'believe' in order to emphasize how you feel about a particular situation.
例句
You can imagine he was terribly upset...
你能想象得出来,他当时心里乱得要命。
You can't think how glad I was to see them all go...
你都想象不到,我看到他们全都走了,心里是多么高兴。
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MODAL
(与 how 一起用于疑问句,表示感受强烈)能,能够
You use can in questions with 'how' to indicate that you feel strongly about something.
例句
How can you complain about higher taxes?...
你怎么能抱怨税费的提高呢?
How can millions of dollars go astray?...
几百万美元怎么可能不翼而飞呢?