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Using “do” or “does” for two things connected by “and”?

I'm writing an interrogative sentence questioning someone else's writing:

"Is grammar and spelling correct?"

Can I use the singular verb "is" or must it be the plural verb "are"?

(The sentence is one of a list of interrogative questions about the quality of writing, e.g. "Are words in the right order?" "Does the copy flow?")

marked as duplicate by JSBձոգչ, RegDwigнt Jan 4 '13 at 21:20

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As a statement it would be plural: Grammar and spelling are correct. It remains plural as a question.

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