When we use Ya + Pretérito Perfecto Simple (Pretérito Indefinido), the meaning of Ya is “already”
Ejemplo:
-¿Te preparo la cena?
-No gracias, ya comí.
But when it is negative, the meaning is “not anymore”.
Ejemplo:
-¿Te sirvo una copa de vino?
- Prefiero agua, ya no tomo alcohol.
Sometimes, “Ya “ is used in the present tense. With this, the meaning is ...