Spanish adverbs that end in -mente are the equivalent of English adverbs ending in -ly. They describe how an action is done. The good news is there is a simple formula to build them from adjectives you already know. Plus the bien/mal vs. bueno/malo distinction that trips everyone up.
Three steps. You start with an adjective, get the feminine form if needed, and add -mente to the end.
Any descriptive adjective can become an adverb.
If the adjective ends in -o, change it to -a. If it ends in anything else, it stays the same.
Attach -mente to the end. If the adjective had an accent mark, it stays exactly where it was.
The adjective, the feminine form it uses, the adverb, and the English meaning all in one table.
These four words trip almost everyone up. The key is whether you're describing how an action is done (adverb) or what something is like (adjective).
Use bien or mal to describe how someone does something. They modify verbs, not nouns. They never change form.
Use bueno/a or malo/a to describe what something or someone is like. They match gender and number of the noun.
Tap any card to check your answer.
Given the adjective, form the -mente adverb. Tap to check.
Decide which word fits. Tap to check and see why.
Complete the sentence with the correct -mente adverb. Then check your answers.