What do adverbs modify?

verbs

like worked SLOWLY
or ate quickly

An ly at the end is a dead giveaway but is not always the case.

Adverbs also modify adjectives and sometimes other adverbs. They can even modify clauses.

modifying an adjective:
~ She was a very talented painter.
adv = very
adj = talented
noun = painter

modifying an adverb:
~ He played the oboe really well.
adv = really (modifies "well")
adv = well (modifies "played")

http://www.chompchomp.com/terms/adverb.htm

Adverbs modify verbs, adjectives, and other adverbs. They provide additional information about these words, such as how, when, where, or to what extent an action is performed. To determine what an adverb modifies, you can follow these steps:

1. Identify the adverbs in the sentence: Look for words that end in -ly or words that describe how, when, where, or to what extent something is done. Examples of adverbs include quickly, carefully, deeply, yesterday, here, and very.

2. Identify the words that the adverbs are modifying: Adverbs typically come before or after the words they modify. If an adverb appears before a verb, it usually modifies that verb. For example, in the sentence "She quickly ran," "quickly" modifies the verb "ran."

3. In some cases, adverbs can also modify adjectives or other adverbs. For instance, in the sentence "He is extremely smart," "extremely" modifies the adjective "smart." In the sentence "He reads very slowly," "very" modifies the adverb "slowly."

By analyzing the position and context of the adverb in the sentence, you can determine what it is modifying.