Question: do adverbs have to end in ly?
Answer: An adverb, on the other hand, modifies a verb, an adjective, or another adverb. Adverbs often have an “-ly” at the end, as in “happily” and “heartily.” ... Such adverbs are usually formed by adding “-ly” to the end of an adjective, as we just did with the adjectives “happy” and “hearty.”