Do numbers not change with parts of speech? This "one" is modifying color, right? It's an adjective. Wouldn't one expect something like "unuan koloron" ?
Number words in adjective form are ordinal numbers.
unu = one ; unua = first
du = two ; dua = second
tri = three ; tira = third
So even though it should be accusative like
We don't do that?
No. Numbers don't take accusative.
Ah, okay. Thanks.
It's one of those examples where Esperanto is perfectly regular and logical except when it isn't :P
This is actually an example where it is perfectly regular.
Only nouns and adjectives take -n endings in accusative. Numbers are not nouns.
Would "la blua flago unu koloras" work?
There's no verb.
"La flago bluas." would have a verb, though.
I feel that "nur" is missing. It's only one color.