What is the simple predicate in sentence The eggs had been beaten before class?

The simple predicate in the sentence "The eggs had been beaten before class" is had been beaten.

Here's why:

* Predicate: The part of the sentence that tells us what the subject does or is.

* Simple Predicate: The verb phrase that forms the core of the predicate.

In this case, the verb phrase "had been beaten" describes the action performed on the subject "eggs."