A simple predicate is the main verb or verb phrase in a sentence that tells what the subject does or is. It is the core part of the predicate without any modifiers or additional information.

Example:

• In the sentence "She runs fast," the simple predicate is "runs."
• In "They are playing soccer," the simple predicate is "are playing."

The simple predicate focuses only on the verb part that expresses the action or state of the subject.