If I understand your question, why buenos with an O and why buenas with an A. The English language has masculine (he is tall), feminine (she is tall) and neuter (they are tall). In my experience, Spanish doesn't usually use neuter, for there is no word for this. So there is a substitute. "La" is a feminine description, so for a very friendly woman, it's usually "La senorita is muy amable". For a man, the destription is "El", so, "El senor es muy amable". "La" incurs the feminine BUENAS; "El" incurs the BUENOS. Why buenOs dias (good morning) and buenAs tardes (good afternoon)? I have no idea. A good Spanish language course will give you a little more understanding. Go for it. It's fun anyway!
Buenas Tardes
"buenas tardes" is Mexican for "good afternoon"
Buenas noches is good night in SpanishTranslation: Buenas noches.Buenas noches. Pronounced Buenos(bway-nahs) noches(no-CHASE)buenos nochesBuenos noches = good nightBuenos tardes = good afternoonBuenos dias = good daybuenas noches
Buenas Noches
Hola Mucho gusto Buenas Buenos dias Buenas tardes Buenas noches
¡Buenos días! ¿Cómo está usted? / ¿Cómo le ha ido?
Buenos días / buen día - Buenas tardes - Buenas noches Buenaa Dias
I Live in Buenos Aires
Buenos tardes!!Buenas tardesbuenas noches
Buenos tardes. buenas tardes"Buenas tardes is how you say good afternoon in Spanish.Buenas tardes.Buenas tardes
The word "noche", night, is feminine. Therefore you need to use feminine adjectives to accompany it. "Buenas noches" is grammatically correct. "Buenos" is masculine and should not be used with a feminine noun.
Nothing, as far as I know... but "buenas noches" means goodnight.