In short, adverbs are words that describe how. They modify adjectives, verbs, or other adverbs. They often end in -ly, but they don't have to. Some people don't like it when they are placed in the middle of an infinitive form of a verb, as in Captain Kirk's “to boldly go,” but “to go boldly” just doesn't have the same punch, does it? By the time a student reaches fourth grade grammar, he or she should be pretty good with adverbs. If she isn't, get on that because it's important. Start with a list of adverbs and practice, practice, practice.