I sometimes hear non-natives say "Whose ever" instead of "Who's ever". Then maybe they confuse it with "Whoever's"?
Where could this come from and is it any way correct?
- You can take whose ever/who's ever/whoever's seat you want.
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Two of the three options are correct:
"Who's ever" is incorrect (unless it stands for "who is ever" or "who has ever", which it can't in this sentence).
The possessive form of "who" is always "whose", although "who's" is a commonly seen misspelling.
(Fowler's Modern English Usage, 1965, has: whoever. Forms. Subjective: whoever, whosoever (emphatic), who-e'er (poetic), whoso (archaic), whosoe'er (poetic). Objective: whomever (rare), whoever (colloq.), whomsoever (literary), whomsoe'er (poetic), whomso (archaic). Possessive: whose ever, whoever's (colloq.), whosesoever (archaic).)
Note: I was unaware until I read Rompey's answer that there exists an alternative one-word spelling ("whosever"); this isn't mentioned in the 1965 edition of Fowler's but is included in the 1996 edition.
Whatever reliable dictionary you look up "whosever" in, you'll find out that it is a single word meaning "belonging to whichever person/of whomever".
So, no apostrophe is needed in
You can take whosever seat you want.