Every day: daily (it rained every day for a week)And so on.
Everyday: common, unexceptional (it was an everyday occurrence)
All right: everything correct
Any one: free choice of one out of all of these (you can choose any one ice cream)
Anyone: existential or universal pronoun (anyone could understand that)
But I got to thinking about forever/for ever. Most of the time, it doesn't seem to make a difference which one you use:
It was taking for ever to finish the essay.It's sort of surprising that, given that these other expressions have different meanings, that it would just be free variation. For isn't a quantifier, but I don't know that that should make a difference. I checked my copy of Fowler's and found the following:
It was taking forever to chop all the potatoes for the stew.
- It's two words when the meaning is 'for all future time' or 'in perpetuity' (he said he would love her for ever).
- It's one word when the meaning is 'continually, persistently, always' (the children are forever asking about more pocket money).
- It doesn't matter when the meaning is 'for a long time' (as above).
I still think you could get away with forever even in the first one, though perhaps not for ever in the second. Almost free variation, then.