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The Quick Answer
Cannot (one word) is the most common expansion of the contraction can't.
cannot(一个单词)是缩写can't展开形式。
Can't can also be expanded to can not (i.e., two words), but this is less common and usually reserved for emphasis.
Can't也可展开为can not(两个单词)，但这种写法很少见，有时只是为了强调。
For example:
I cannot do it!
(Can't is usually expanded to cannot.)
Can't通常展开为cannot
I can not do it!
(This is considered more emphatic.)
这样更强调
Of course, the words can and not sometimes appear alongside each other when the not forms part of another construction (such as not only).
当然，can和not有时只是因为各自的搭配而碰巧在一起。
For example:
Kevin can not only rap but dance too.
凯文不仅会饶舌，还会跳舞。
(Here, can not must be written as two words. It is not an expansion of can't.)
在这里，can not必须写两个字，而不是can't展开形式。
◆◆Cannot or Can Not?◆◆
Cannot and can not are interchangeable as expansions of the contraction can't.
cannot和can not在作为can't展开形式可以相互替代。
However, the modern preference is to use cannot. Of note, many spellcheckers even highlight can not as an error.
然而，在现代，人们更倾向于使用它cannot。值得注意的是，许多拼写检查软件甚至突出显示can not拼写错误。
◆◆ Cannot和Can Not的例子◆◆
Here are some famous quotes featuring cannot and can not.
这里有一些包含cannot和can not名言供您参考
You cannot escape the responsibility of tomorrow by evading it today.?
你今天回避了责任，明天还存在。
-Abraham Lincoln 亚伯拉罕·林肯(第十六任美国总统)
There cannot be a crisis next week. My schedule is already full.?
下周不可能有危机，我的日程早就排满了。
-Henry A. Kissinger 亨利·基辛格
Conflict can not survive without your participation.?
没有你的参与，冲突就不会发生。
-Wayne Dyer 韦恩·戴尔
(We have marked this wrong because can not is not the modern convention.因为把这个标记为错误的用法，因为can not不是现代习惯。
A flower cannot blossom without sunshine, and man cannot live without love.?
没有阳光，花儿不能绽放，没有爱的人不能生存。
-Max Muller 麦克斯·穆勒
Three things cannot be long hidden: the sun, the moon, and the truth.?
有三件事不能长期隐藏：太阳、月亮和真理。
◆◆Can Not 用于强调◆◆
You should use can not over cannot when the not is emphasized.
只有当not当你被强调时，你需要考虑它can not而不是cannot
For example:
I can not tolerate laziness!?
我不能容忍懒惰
The two-word version makes it clearer that the word not should be emphasized. This is most useful in an exclamatory sentence, i.e., one that ends in an exclamation mark.
用两个单词的写写作方法not强调的意思更清晰。通常用于感叹句，即结尾有感叹号的句子。
◆◆
必须用Can Not的时候
◆◆
It is possible to see can and not as two separate words, especially with the correlative conjunction not only...but also.
将can和not作为两个单独的单词来使用时是可以出现can not特别注意关联词的形式not only...but also里这个not。
Danielle can not only cook but also bake.?
丹妮尔不仅会做饭，还会烤面包。
My dog can not only roll over but also play dead.?
我的狗不仅会翻身，还会装死。
In these examples, cannot is not an option.
在这样的句子中，cannot不能用。
看到这里，
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还有什么问题？
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