The following are my understanding about using "whosever." Please correct me if I'm wrong. Thank you.
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? Whosever answer, if correct, comes out first gets the prize.
? Correct, and it means anyone whose answer, if correct, comes out first gets the prize.
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? Whosever proposal promises the greatest profit will be adopted.
? Correct, and it means the proposal, no matter whose (proposal) it is, that promises the greatest profit will be adopted.
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? Whosever number I dialed last night will show up today.
Correct, and it means anyone whose number I dialed last night will show up today.
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? Whosever number I dialed last night has proven wrong.
? Correct, and it means the number, no matter whose (number) it was, has proven wrong.
I'm afraid they're all wrong. It's used to replace 'whoever' in formal and legal English. Most native English-speakers never use it in their lifetimes.
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I'm afraid they're all wrong.
It's used to replace 'whoever' in formal and legal English. Most native English-speakers never use it in their lifetimes. Forget it.
? Whoever is first to get the right answer wins the prize.
(The others need a complete rewrite.)