How something is done: quickly, carefully, well, badly
Adjective + -ly (usually); some are irregular
Subject + verb + not + adverb
How + do/does + subject + verb?
💡 Adjectives ending in -y: change to -ily (happy → happily). Ending in -le: change to -ly (simple → simply).
✓She sings beautifully.
✗She sings beautiful.
Use adverb (beautifully) to modify verb.
✓He works hard.
✗He works hardly.
Hard is irregular; hardly means 'almost not'.
✓She speaks English well.
✗She speaks English good.
Good is adjective; well is adverb.