A predicate is the part of a sentence that tells us something about the subject. It usually includes the verb and any objects, complements, or modifiers that go with it.
Here's an example:
* Subject: I
* Predicate: am happy.
In this case, "am happy" is the predicate because it tells us something about the subject "I."
The word "am" acts as the linking verb in the predicate, connecting the subject to the predicate adjective "happy."