作为情态动词，can后面接动词的原形形式，它在否定句中可以直接加上not，形成cannot，缩略成can't，在疑问句中可以直接拿到主语前，构成疑问句和部分倒装句。它的具体用法如下：
一、表能力。
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。
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。
二、表示可能。
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。
三、表示允许。
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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