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“It is they who lied” or “it is them who lied?”
What rules make “Remember me, who am your friend” grammatical?

Which one of these is correct?

It is I who am at fault.

It is me who is at fault.

The word "is" is a conjugation of "be" which is a linking verb.

I also want to know the same for 2nd person.

It is you who are at fault.

It is you who is at fault.

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Your question presupposes there must exist one and only one right answer. It does not admit the possibility that there are no right answers at all, or that there are two. That’s going to be a problem with this one. –  tchrist May 25 '12 at 3:10
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Possible duplicate of “It is they who lied” or “it is them who lied?” –  Fuhrmanator May 25 '12 at 4:08
    
Related questions also found here, here, here, here, here, and here –  tchrist May 25 '12 at 6:44
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marked as duplicate by RegDwigнt May 25 '12 at 8:49

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1 Answer

Research associated with the ‘Longman Grammar of Spoken and Written English’ shows that when the first person pronoun is final, me is more common than I ‘(It’s me’), but that when there’s a following relative clause, the opposite is true (‘It’s I who . . .’). That would suggest that It is I who am at fault is preferred over It is me who is at fault, assuming we reject the hybrid It is I who is at fault. Applying the same logic to the second person pronoun, we may suppose that It is you who are at fault is more popular than It is you who is at fault.

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An ngram for “it is you who is/are” suggests a strong preference for the “It is you who are” version over the “It is you who is” version. If there is no agreement, wouldn’t “It’s us who is” be what people would use? But they don’t: it is “us who are” because there are several of us. “...you who is” sounds as funny as “...us who is”. –  tchrist May 25 '12 at 6:55
    
Well, there is agreement, but it’s notional or proximity agreement rather than formal agreement. In the first person plural I imagine ‘It is we who are at fault’ would be more frequently found than ‘It is us who are at fault.’ –  Barrie England May 25 '12 at 7:08
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Yes, it is: much much more frequent. –  tchrist May 25 '12 at 7:09
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