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MODAL
(表示某事物的特點)能夠，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...
在肉類中,豬肉的做法也是最多的,可以整塊烤來吃,也可以切片烤來吃。
Luckily, iron can be reworked and mistakes don't have to be thrown away...
所幸的是,鐵可以再加工,次品、廢品不必被扔掉。
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MODAL
(表示有能力或機會)能，會，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...
你別擔心我,我能照顧好自己。
I can't give you details because I don't actually have any details...
我沒辦法給你提供細節,因為我并不了解任何細節。
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MODAL
(用于否定句，表示情況不允許)不能，無法
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...
看不起電影或聽不起音樂會的人可以去觀看足球賽。
We cannot buy food, clothes and pay for rent and utilities on $20 a week...
一個星期才20美元,不夠我們吃穿、付房租及水電等費用的。
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MODAL
有可能;有時會
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...
有可能持續5年乃至更長時間的長期治療。
A vacant lot or a bombsite can, to the amateur naturalist, produce an extraordinary variety of flora and fauna...
對于業余博物學者來說,在一片空地上或被炸后的廢墟里可能發現種類繁多的植物群和動物群。
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MODAL
(用于否定句，表示確信某事不真實或不會發生)不可能，不會
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...
根據她對道格拉斯習性的了解,她敢斷定他不可能是那個襲擊者。
Things can't be that bad...
情況不會糟到那個地步。
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MODAL
(表示允許)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...
你必須先購買信用人壽保險,方可購買傷殘保險。
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...
任何人若想成立廢品處理公司,必須證明其擁有足夠資金和受訓員工以保證工作可以順利開展。
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MODAL
不行;不能;不該
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...
這種情況忍無可忍,不能再任其繼續下去了。
The Commission can't demand from Sweden more than it demands from its own members.
委員會對瑞典的要求不能比對自己的會員國要求都多。
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MODAL
(通常用于疑問句，表示建議或提議幫忙)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?...
我在這兒能做點兒什么?
This old lady was struggling out of the train and I said, 'Oh, can I help you?'...
我看見這位老太太正顫巍巍地下火車,就問:“嗯,我來幫您一把嗎?”
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MODAL
(用于疑問句時,can 表示禮貌的請求，而 can't 表示強烈請求）
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?...
我能不能看一眼那個?
Can you please help?...
請你幫個忙好嗎?
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MODAL
(用于有禮貌地打斷,或引導要說的話)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?...
我能不能打斷你們一下?
But if I can interrupt, Joe, I don't think anybody here is personally blaming you...
對不起,喬,我插一句,可我認為在座的沒有誰在埋怨你。
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MODAL
(與 imagine, think, believe 等動詞連用,用來加強語氣)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...
你能想象得出來,他當時心里亂得要命。
You can't think how glad I was to see them all go...
你都想象不到,我看到他們全都走了,心里是多么高興。
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MODAL
(與 how 一起用于疑問句,表示感受強烈)能,能夠
You use can in questions with 'how' to indicate that you feel strongly about something.
例句
How can you complain about higher taxes?...
你怎么能抱怨稅費的提高呢?
How can millions of dollars go astray?...
幾百萬美元怎么可能不翼而飛呢?