I am reading the book High School English Grammar & Composition by Wren & Martin.
While defining Pronoun, the following sentence appears as an example:
The books are where you left them.
Now my question is, is the word "you" too a pronoun in this particular sentence, just like the word "them"?
The authors have italicised the latter word but not the former, which has been done because the former word does not replace any explicit noun in the sentence.
Here is Wren & Martin's definition of Pronoun:
A Pronoun is a word used instead of a noun; ...