Do not confuse anyone with any one. Anyone always refers to people. In the phrase any one, 'one' is a pronoun or a determiner that can refer to either a person or a thing, depending on the context. It is often followed by the word of. Parting from any one of you for even a short time is hard... None of us stay in any one place for a very long time. In these examples, any one is a more emphatic way of saying any. Anyone or anybody is mainly used in questions and negative sentences. You use not anyone instead of someone in negative sentences. There isn't anyone here... There isn't anybody here.

切勿混淆anyone和any one。anyone总是指人，而短语any one中的one可以作代词也可作限定词，根据上下文既可指人也可指物，后面常跟of：Parting from any one of you for even a short time is hard（要离开你们中的任何一人，即使时间很短暂，也是件令人难受的事），None of us stay in any one place for a very long time（我们谁也没有在任何一个地方久留过）。在上述例子中，any one是any的强调性说法。anyone或anybody主要用于疑问句或否定句。在否定句中不用someone，而用not anyone：There isn't anyone here（这儿没有人），There isn't anybody here（这儿没有人）。