Verbs are words that show an action, occurrence, or a state of being. Your students may be confused about the differences between verbs and predicates. Simply put, a sentence can be divided into two parts: the subject and the predicate. The predicate is everything that is not the subject, and it contains the verb. In sentences that are made up of only two words (i.e. "Jennifer cooked."), the verb and the predicate are the same thing.
Fun Project Idea: Have your students perform the Schoolhouse Rock "Verbs" song (available on YouTube) for extra reinforcement of the definition and use. A whole slew of worksheets for this topic can be found below.