How many pronouns are in the following sentence Put on your thinking cap?

There are zero pronouns in the sentence "Put on your thinking cap."

Here's why:

* Pronouns are words that replace nouns.

* In this sentence, "your" is a possessive adjective, not a pronoun. It describes the "thinking cap."

* The rest of the words ("put," "on," "thinking," "cap") are verbs, prepositions, and nouns.