An adverb is a word that modifies or describes a verb, adjective, other adverb, or sentence. There are several types of adverbs including manner, time, place, degree, frequency, interrogation, and negation. Adverbs can be placed in initial, mid, or end position in a sentence, with some exceptions. Adverbs are often formed by adding -ly to adjectives or replacing word endings with -ly or -ically. Using the correct adverb makes writing more interesting.