"It is I" is grammatically correct even though it is not really used in spoken English; however, this is how it should be written in formal or academic texts. Here is an example: He is better than I Why "l" and not "me"? Because if you continue, the sentence goes like this: He is better than I am. Not than me. "I" is a personal pronoun in the subject form and "me" is a personal one as well but in the object form. Another example: The new president is she. Why "she" and not "her"? Because, she is the new president. Does that make sense?

'It is me' IS perfectly correct. Don't believe anyone who tells you otherwise! Likewise, the phrases 'It's her', 'It's him', and so on are perfectly correct. These are disjunctive pronouns, and this usage is a natural and commonplace feature of the language. We would only say 'It is I' for dramatic effect. In most situations, using the subject pronoun in this way sounds awkward, pretentious and inappropriate. [NB Native English speakers have an uncomfortable relationship with the pronouns 'I' and 'me'. Many of us have an uneasy feeling that using 'me' must be wrong in some way,= and that 'I' must be correct/formal/ what you are 'supposed' to say. ( Memories of being rapped over the knuckles for saying 'Me and friend were there'). As a result, people tend to overcompensate by using 'I' whenever they're trying to 'talk proper' (sic). This is why you will hear even well-educated people saying appalling things like 'This is a picture of my brother and I'.]

"It is me" is perfectly correct. "It is I" is technically correct (the rule here is "be" as a copula verb) but it sounds extremely formal and dramatic - which is the intent of that line in the movie, I suppose.

Hi Ann, Strictly speaking, "It is I" is correct and "It is me" is incorrect. If you ask a grammarian (a specialist in English grammar), a teacher or an English major, they will tell you this is the traditional rule. However, in daily use over time, I guess people keep saying "It is me" because it SOUNDS correct, and that becomes common, and is understood by everyone. So you can say "It is me" in daily conversation, it is understood and accepted by most people as the common usage. If you are writing an English essay for school or college, you should write "It is I". If your book or your teacher teaches you "It is me", then you have a bad book or a bad teacher.

Usually we say "It is me". But if you want to sound formal you can say "It is I". "It is I" was a popular saying in English in the 17th,18th, and 19th centuries but it has fallen out of modern English. But you can still use it if you like.