Debes ejecutar el golpe rápida y eficazmente.

Questions & Answers about Debes ejecutar el golpe rápida y eficazmente.

Why does the sentence use rápida instead of rápidamente?
When joining two or more adverbs that end in -mente with y or o, only the last adverb keeps the -mente ending. The first adverb, rápidamente, drops the suffix and becomes rápida.
Since the suffix is dropped, why is it the feminine rápida rather than the masculine rápido?
Adverbs ending in -mente are always formed using the feminine singular version of the adjective. When you drop the -mente to share it with eficazmente, you are left with that feminine base form, rápida.
Why doesn't eficaz change its ending before getting -mente?
Adjectives that end in a consonant, like eficaz, or the letter -e don't have separate masculine and feminine forms. Because there is no special feminine form, you just attach -mente directly to the standard adjective.
Could we reverse the order and say eficaz y rápidamente?
Yes, you can swap them. If you do, the rule applies exactly the same way to the new first word: you drop its -mente. Because the base feminine form of eficaz is just eficaz, the phrase becomes eficaz y rápidamente.

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