有些英美学者认为，anyone不能分写成any one，而有些学者则认为可以，但有以下区别：
（一）anybody 等于anyone.anyone专用以指人，不指物，意思是“任何人”， 重音落在any了之上，它不作“任何一个”解；any one既可用以指人，又可用以指物，其意为“任何一个”，如any one of you（不用anyone of you），重音落在one之上。
（二）any one比anyone更强调“个别”（more distributive force）的意味；anyone则含有“全体”、“毫无例外”（all and without exception）之意。因此，其后有时可用复数形式的代词来指代它。如：
Anyone can enter for the competition，can't they？
下面请对比anyone和any one在句中的不同涵义：
Anyone may pay a visit to the palace。任何人（即所有的人）都可以到皇宫一游。
Any one of uw may paya visit to the palace.我们当中任何一个都可以到皇宫－游。
Anyone who does it is risking his life.任何人做此等事都要冒着生命危险。
请注意，anyone之后不能用one's或one等词来指代它，如上句不能改作Anyone who does it is risking one's life。
Which screw do you want? Any one will do. “你要哪一枚螺丝钉？” “随便哪个都行”。
与之类似区别的的词有：anybody和any body; anything和any thing; eneryone和every one; everybody和every body。
如所周知，everyone, everybody, anyone, anybody,every, each等词一般都是表示“单数”的概念，句中其后指代的代词用his或her。但在现代英语中，不少英美人士却用复数的代名词来代替单数代词。下面的例句都是选自英美的知名文学家的作品：
Nobody knows what it is to lose a friend till they have lost him. (Fielding)
I do not mean that I think anyone to blame for taking due care of their health. (Addison)
Everybody is discontented with their lot in life. (Beaconsfield)
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