The auxiliary English verb "would" has several different ways it can be translated to Spanish. As with other problems of translation, the key to proper interpretation is understanding what is meant, not the words that are used.
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The conditional tense: When "would" is used to indicate supposition, the possibility of something happening contingent on something else, or the likelihood of something, it typically is the equivalent the Spanish conditional tense.
- Examples: Te gustaría salir? (Would you like to leave?) No compraría este libro. (I would not buy this book.) El asesinato del presidente sería un crimen de guerra. (Assassinating the president would be a war crime.)
- Examples: Le exasperaban las quejas de sus hijos. (His children's complaints would exasperate him.) Durante el día trabajaba mucho. (During the day she would work a lot.)
- Se negó a estudiar otras alternativas. (He wouldn't study other alternatives.) Por eso me negué a firmar. (Because of that I wouldn't sign.)
- La radio del coche no me funcionó en ese momento. (The car radio wouldn't work for me at that moment.) Muchas veces la radio del coche no me funcionaba. (The car radio often wouldn't work for me.)

