Is the following sentence correct : Books help you know the 'Whys' and 'Hows' of everything.
That is a matter of style. " Oxford implies the same.
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That is a matter of style. Chicago has it "Books help you know the whys and hows of everything." Oxford implies the same.
No, I don't think that is correct. It should be like:
Books help you to know the whys and hows of everything.