What part of speech is the word IT play in sentence Silver will tarnish if not polished often?

The word "it" in the sentence "Silver will tarnish if not polished often" is a pronoun.

Here's why:

* Pronouns stand in for nouns. In this sentence, "it" represents the noun "silver".

* The sentence is essentially saying "Silver will tarnish if silver is not polished often."

* "It" acts as the subject of the verb "tarnish".

Let me know if you have any other grammar questions!