See Inside: If You Were an Adverb
by Michael Dahl 

Below are sample pages from inside If You Were an Adverb written by Michael Dahl and illustrated by Sara Dahl. In the top spread, the relationship between verbs and adverbs is compared to that of peanut butter and jelly in a sandwich...they "go well together. / If you were an adverb, you would work closely with verbs."  We think that's a really cute and effective way to describe it. :)