Emphasizes the transition from "not happening" to "happening"
Encoding Strategies:
repetition

Ya emphasizes the change that occurs when something happens, implying it wasn't happening earlier.
ya
already (past)
Something has happened, but earlier it hadn't.
Ya terminé la tareaI already finished my homework (before then I hadn't finished it)
Ya llegaronThey already arrived (before then they hadn't arrived)
now, right now (present)
Something is happening now, but a moment ago it wasn't.
Ya sé la respuestaI know the answer now (a moment ago I didn't know it)
Tenemos que irnos yaWe have to leave now (a moment ago we didn't have to leave)
someday, eventually, at some point (future)
Something will happen, but it hasn't happened yet.
Ya verás cómo todo sale bienYou'll see how everything works out fine (but as of now you can't see it)
Ya lo entenderás cuando seas mayorYou'll understand eventually when you're older (but as of now you don't understand)
ya no
no longer, not anymore, anymore (negation)
Something is no longer happening, but earlier it did.
Ya no vivimos en esa ciudadWe no longer live in that city (but before, we did live there)
Ya no me quiereShe doesn't love me anymore (but before, she did love me)
ya que
since, now that, given that (causal)
Now that something has happened, something else follows from it.
Ya que estás aquí, ayúdameSince you're here, help me (now that you're here, as opposed to when you weren't)
Ya que lo sabes, cuéntame todoNow that you know, tell me everything (now that you know, as opposed to when you didn't)