Is this sentence correct?

<p>

What book?

Yes, but “you” is not really plural. It just requires a plural verb. It is not a plural pronoun or noun, so it does not count.</p>

<p>

“You” is a singular pronoun.
Source: <a href=“http://www.wsu.edu/~brians/errors/eitherare.html[/url]”>http://www.wsu.edu/~brians/errors/eitherare.html&lt;/a&gt;&lt;/p&gt;