- see guess.
Any one is not the same as anyone, and the two forms should not be used interchangeably. Any one, meaning ‘any single (person or thing),’ is written as two words to emphasize singularity: any one of us could do the job; not more than ten new members are chosen in any one year. Otherwise it is written as one word: anyone who wants to come is welcome. Note that this distinction is structurally similar to, although not identical with, the difference between every day and everyday: see everyday (usage).