The grammar police nabbed me recently. A client whose academic paper I was editing objected to one of my corrections. He pointed out that in a sentence where the subject is in the form “Not only…but also,” the verb must agree with the noun in the “but also” part.

Example: “Not only language ninjas but also Rocky Mountain English professors know this rule” and “Not only the Language Ninja, but also the Rocky Mountain English Professor knows this rule” are correct, but “Not only language ninjas, but also the Rocky Mountain English Professor know this rule” is not.

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