Any one
Any one is a term that means any single object or person.
- Any one of those fools could be the next in charge. (Both any and one are referring to ‘fools’.)
- Any one of these films would keep you entertained. (Both any and one are referring to ‘films’.)
- The teacher never raised her voice to any one of her students. (Both any and one are referring to ‘students’.)
Anyone
Anyone is only used for people and is just like saying ‘anybody’. Anyone is used more commonly in writing and therefore a little more formal.
- Would anyone like to order a drink? (Would anybody like to order a drink?)
- Anyone can hold the helm when the sea is calm. (Anybody can hold the helm when the sea is calm.)
- Does anyone have the correct time? (Does anybody have the correct time?)
Libertad tip:
Knowing which one to use – remove the word ‘any’ or the word ‘one’ and if it still makes sense, then you need the two words ‘any one’.