An adverb is a word that describes or provides additional information about a verb, adjective, other adverb, or entire sentence. Common types of adverbs include manner, place, time, frequency, degree, and probability. Many adverbs are formed by adding "-ly" to an adjective, though some such as "very" and "never" do not follow this pattern. Adverbs are used to compare actions or states and show which is better, worse, faster, etc. using comparative and superlative forms. Proper placement of adverbs depends on the type and specific word.