Form and rules
How it works
Many adverbs of manner are made with adjective + -ly: slow → slowly, careful → carefully.
Use an adverb to describe an action verb: She speaks quietly.
Use an adjective after linking verbs such as be, look, feel, smell, sound, and taste: The soup smells good.
Good is an adjective; well is the usual adverb: a good singer / she sings well.
Some common words have the same adjective and adverb form, such as fast and hard.