What is the simple predicate in this sentence farmers have plowed fields?

The simple predicate in the sentence "Farmers have plowed fields" is have plowed.

Here's why:

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

* Simple Predicate: The simple predicate is the verb (or verb phrase) that forms the core of the predicate.

In this case, "farmers" is the subject, and "have plowed fields" is the predicate. The verb phrase "have plowed" is the simple predicate because it tells us the action the subject performs.