What pronoun Identifies what a sentence is about?

The pronoun that identifies what a sentence is about is the subject.

Here's why:

* Subject: The subject of a sentence is the noun or pronoun that performs the action of the verb. It's the "who" or "what" the sentence is about.

* Example: She went to the store. (The subject is "she," and the sentence is about her.)

Let me know if you'd like more examples or explanation!