Quote:
Originally Posted by icarus
Both are grammatically incorrect. The second one has been explained above. The first has incorrect subject/verb agreement; 'none' is singular, thus you should have responded, "none of them is mine." Now an interesting question is whether your boss was correct or incorrect; can 'which' be both singular and plural? 'Which ones?' presumably could have a plural answer. I tend to think 'which' can be both singular and plural (like 'you'), and thus "which is" and "which are" can each be correct depending on the context.
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I'm not sure, but I don't believe that is correct. "None" should be plural in this context because "them" is plural, and the usage does not conflict the former's meaning.