Adverbs in Portuguese are very similar to adverbs in English. They are adjetivos (adjectives) that describe a verbo (verb). Also, English adverbs generally end in -ly, while Portuguese adverbs usually end in -mente. For example:
A Luana canta bem. (Luana sings well.)
O João provavelmente está doente. (João is probably sick.)
Other times, an adverb can be used when describing an adjective or another adverb. For example:
A Diana dirige muito devagar. (Diana drives very slowly.)
Here, muito is an adverb describing another adverb, devagar.
Other common adverbs include hoje, ontem, cada, ainda, and já (today, yesterday, every, still/yet, and already) that describe time. Aqui, lá, alí, fora de, abaixo, and aí (here, over there, there, outside, below, and there) describe place. These don’t have the typical -mente ending and it’s important to be familiar with the irregular forms of these adverbs.
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