The predicates
Simple predicates
Sentences consist of two basic parts : subjects and predicates.
The simple predicate, or verb, is the main word or word group that tells something about the subject.
A verb expresses action or a state of being.
Simple predicates 
Corn grows well in our state. [Grows is the simple simple predicate and tells what corn does.]
The recycling bin is under the sink. [Is is the simple predicate and tells about the recycling bin.]
Reminder 
A simple predicate can be a one-word verb or a verb phrase.
Example
The student council meets every Wednesday. [Meets is the simple predicate and tells what the student council does.]
Has your group completed the chemistry experiment? [Has completed is the simple predicate and asks what your group did.]