<p>When I opened the door, I screamed out with enjoyment, It is me!</p>
<p>Why is it, "It is I"</p>
<p>Hmm that’s weird. That’s a crappy sentence, what book is that from? I’m assuming because “It is I” goes with the parallel structure of the sentence (when I, I screamed)</p>
<p>The I in “It is I” is a predicate nominative [a noun that follows a linking verb and is equivalent to a noun]. It’s always in “subject form” *, not “object form” [me].</p>
<p>Example: The doorman was he.
not a pred. nom.: The doorman was going to him.</p>
<p>…It does sound awkward and stupid, though. And someone please correct me if I’m wrong on the grammar here.</p>
<p>First of all, I don’t believe that will ever be on the actual SAT.</p>
<p>Secondly, verylikeawhale is correct. A pronoun in the predicate of a sentence always takes the objective form (me, him, her) unless it is renaming the subject (hence “predicate nominative”), in which case it takes the subjective form (I, he, she).</p>
<p>So you would say, “It ate me,” but “It was I.” The pronoun changes just based on the verb used.</p>
<p>On a side note, it’s interesting to see how colloquial expressions are often grammatically incorrect, and how the grammatically correct phrases sound awkward. For instance, “me too” should actually be “I too.” :)</p>