"Red and blue are colors."

Translation: Vermelho e azul são cores.

[delvi]

If one is discussing colours, why is "vermelha" not correct? "cor" is feminine, so should one not use "vermelhA"?

[marichireino]

Yes, but you are not using "vermelho" as an adjective for "cor", it is a noun in this case so it should be masculine. It would be correct in the sentence "a cor vermelha", but in this case "vermelho é uma cor".

[delvi]

Obrigada. Isto ajuda-me muito. :)

[annekarakash]

O vermelho e o azul são cores. Seems like that should be okay. Am I wrong?

[Phobic]

It's possibly nitpicking, but the sentence asked for "Red and blue", not "The red and the blue". There is usually very little lenience with articles; "um" and "o" are not interchangeable. I guess "o" and the absence of an article are not interchangeable, either?

[cinthiia_mc]

In portuguese it's very common to use articles where english doesn't. So "o vermelho e o azul são cores" should be right too.

[Loggar]

actually you are right, it would fit fine in the phrase

[DamienLawr]

So in conversation, if I were to say vermelha in this context instead of vermelho, I would sound like an uneducated illiterate?

[Loggar]

Yes, vermelha doesnt exist in any context unless something like reddish- as in AVERMELHADA

[delvi]

Are you saying that "A camisa vermelha" is wrong???

[Loggar]

No, I'm really sorry, my mistake - in that case were its applied to a "THING" it's indeed possible. I forgot about that example

[Jim67564]

How come we don't use the definite article before the colors here?