uno

Uno no puede vivir sin dormir bien.

One cannot live without sleeping well.

Dame uno de esos, por favor.

Give me one of those, please.

Es la una de la tarde y aun no ha comido.

It is one in the afternoon and she still has not eaten.

Uno de mis hermanos vive en Argentina.

One of my brothers lives in Argentina.

Solo me queda uno de esos chocolates.

I have only one of those chocolates left.