> "Who is it?" “It” is not used here because we don’t know the gender. Consider “Who is she?” for example, which is a very different question. > "It was Bob!"

> "Who is it?" “It” is not used here because we don’t know the gender. Consider “Who is she?” for example, which is a very different question. > "It was Bob!" Why wouldn’t we say “He was Bob!” in this case, since the gender is presumably known? Because “He was Bob” and “It was Bob” mean completely different things.