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QUICK ANSWER
"Hablamos luego" is a form of "hablamos luego", a phrase which is often translated as "let's talk later". "OK" is an interjection which is often translated as "OK". Learn more about the difference between "OK" and "hablamos luego" below.
OK(
oh
-
key
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
hablamos luego(
ah
-
blah
-
mohs
lweh
-
goh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. let's talk later
En este momento no puedo hablar. Hablamos luego, cuando yo llegue a casa.I cannot talk at the moment. Let's talk later, when I arrive home.
b. let's speak later
Hablamos luego, que ahora mismo tengo mucha prisa.Let's speak later. I'm in a hurry right now.
a. we'll talk later
He quedado con ella en que lo hablamos luego, pero no creo que pueda convencerla.I have agreed with her that we'll talk about it later, but I don't think I'll be able to convince her.
b. we'll speak later
Se me está descargando la batería, pero no importa, hablamos luego en persona.My battery is running down, but never mind, we'll speak later in person.
a. we talked later
En ese momento no pudimos decirnos nada, pero hablamos luego y él estaba verdaderamente afectado.We couldn't say anything to each other at that moment, but we talked later and he was really shocked.
b. we spoke later
¿No te acuerdas de que hablamos luego y decidimos ir el martes en lugar del lunes?Don't you remember that we spoke later and decided to go on Tuesday instead of Monday?