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whys and wherefores

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All the underlying causes and reasons, as in She went into the whys and wherefores of the adoption agency's rules and procedures. This idiom today is a redundancy since why and wherefore mean the same thing. Formerly, however, why indicated the reason for something and wherefore how it came to be. [c. 1600]

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GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!
Test how much you really know about regular and irregular plural nouns with this quiz.
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Which of the following nouns has an irregular plural form?

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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