# Adverb An adverb is a category of words. An adverb is often used to describe an action or situation. An adverb does not change its form. In English, adverbs often end in the letters -ly. ## More Information about this topic *How else can an adverb be used?* * An adverb can be used to describe an adjective. * An adverb can be used to describe another adverb.