Why is good night spelled with an a in buenas noches instead on with an o in buenos dias?

Question

As I was reviewing over the greetings I noticed that the good in good night and good morning/good day is spelled differently for each other. I was wondering why is is that way. This is not much of a translate for me type of question but it is grammar.

Why is good night spelled with an a in buenas noches instead on with an o in buenos dias?

Answer 1

Hola, Horselover! Good question.

That is because "noches" is a feminine plural noun, so therefore, the feminine plural adjective is needed.

As for "días", that is a masculine plural noun, so the adjective modifying it must correspond in gender and number, hence buenos.

Remember, remember, remember...adjectives have to match what they are modifying in gender and number!!!

I hope I've helped

Great answer Sonrisa :) You got there before me lol I had problems with the pages not loading - FELIZ77, Sep 20, 2011

Answer 2

Because it's la noche (feminine) and el día (masculine).

The adjective (bueno, -a) has to be in agreement with the noun.

You have to use bueno with a masculine noun and buena with a feminine one.