Today I'm going to list sets of words that are the source of common errors in writing and explain each version and its proper usage.
The first set is anyone vs any one.
Anyone is an indefinite pronoun, whereas any one is an adjective phrase that refers to an unspecified thing or individual. One way to remember is you can use anyone when you mean anybody.
Does anyone know who took Mary home?
There were over twenty people at the party. It could have been any one of them.
Next let's look at altogether and all together. The phrase all together means doing something collectively as a group, while the word altogether means entirely.