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Possible Duplicate:
What rules make “Remember me, who am your friend” grammatical?

Am aware it is correct to say "I have written..." and "I am a doctor who has writen..."

I have, however, severally come across the sentence "I, Tertius, who have written...". Shouldn't it be "I, Tertius, who has written..."?

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According to Fowler's Modern English Usage, "relatives take the person of their antecedents". This means that "who" in the example is first person, not third person, because its antecedent is "I". So "I, Tertius, who have written" is correct.

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