Some adverbs tell us how an action is or should be performed.

Often these adverbs are formed by adding -ly to the end of an adjective.

Adjectives ending -l add -ly ; careful-carefully.

Adjectives ending -y change to -ily ; lucky-luckily

Adjectives ending -ble change to -bly ; responsible-responsibly

adjective
adverb
anxious
anxiously
bad
badly
beautiful
beautifully
capable
capably
careful
carefully
quick
quickly
weak
weakly

For example:

The president walked down the ramp carefully. In this sentence carefully modifies the verb walked (to walk).