Many adverbs are formed by adding -ly to the end of an adjective.
| ADJECTIVE | She received a quick answer. |
| ADVERB | Her sister answered quickly. |
To decide whether to use an adjective or an adverb, find the word being described. If that word is a noun or pronoun, use an adjective. If it is a verb, adjective, or another adverb, use an adverb.