1) Whichever of them hands in their paper before the end of the month will get five extra points.
2) Whoever among them hands in their paper before the end of the month will get five extra points.
3) Whoever hands in their paper before the end of the month will get five extra points.
Which of the above sentences could be used if the assumption is that
a) more than one of them will hand in their paper before the end of the month
or
b) it is possible that more than one of them will hand in their paper before the end of the month
The first two are not idiomatic. The third is good for these cases: 1. Nobody hands in a paper.
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The first two are not idiomatic.
The third is good for these cases:
1. Nobody hands in a paper.
2. One person hands in a paper.
3. Several people hand in a paper.
4. Everyone in the class hands in a paper.