In "you wonder if it is you who are wrong" "you" is the subject of  
"wonder."  "if it is you who are wrong" is a noun clause used as the  
direct object of the verb "wonder." "You" is a subjective complement  
of "it" in the clause "it is you." "who" is the subject of the  
adjective clause "who are wrong." Since "who" refers to "you," the  
verb must agree with "you." The verb "are" is therefore correct.

> In "You wonder if it's an error at all, or if, in fact, it is you  
> who is wrong" the same is true. "Who" refers to "you." "You" is in  
> second person; therefore "who is" is incorrect; it should be "you  
> who are wrong." gww




On Feb 14, 2012, at 11:28 AM, Scott Carledge wrote:

> I would have said I wonder whether it is you who is wrong.  "I" am  
> doing the
> wondering; "it" is the subject of the next clause, "who" of the third
> clause.
> Scott

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