Na de werkwoorden die te maken hebben met je zintuigen (to feel/to taste/to smell en het werkwoord to be krijg je geen -ly.
There are also irregular adverbs. The adverb for good is well - She's a good performer. She performs well.
A few adverbs have the same form as the adjective.
Fast (snel), fair (sportief/eerlijk), low, high, hard, long, late, loud and straight (onmiddelijk) - He's a fast driver, He drives fast.