What is a part of sentence that tell something about the subject?

The part of a sentence that tells something about the subject is called the predicate.

Here's a breakdown:

* Subject: The person, place, thing, or idea that the sentence is about.

* Predicate: The part of the sentence that contains the verb and tells us what the subject does, is, or has.

Example:

* Subject: The cat

* Predicate: slept on the couch.

The predicate ("slept on the couch") tells us what the subject (the cat) did.