An adverb, (adverbio in Spanish) in traditional grammar, is known as a word that modifies a verb. Common examples of adverbs in English are tomorrow, quickly, now, and fast. English adverbs are often marked with the suffix -ly. Most Spanish adverbs use the ending -mente.
Some Spanish words like rápido use an accent mark. When that adjective is changed into an adverb, some contend that it should lose its accent mark (rapidamente), while others feel it should stay (rápidamente).
Types of adverbs