I will tell you...
If "I will" is understood in sentences like:
Te diré mañana.
Voy a decirte mañana.
If somebody says to you, "Tell me tomorrow.", how do you reply simply with, "I will."?
3 Answers
Well, what are these things like "will" and etc. called? Auxiliary verbs, helping verbs, something along those lines. They don't use them in as often in Spanish. So it seems like in most cases like this you just say "sí" or "vale," "ok," or whatever.
A while back I asked a similar question about "I don't." For example: "I like to dance in the rain." "Well, I don't!"
--Me gusta bailar bajo la lluvia. --Pues, a mí no.
I think in Spanish there are only like three helping verbs? Haber and Estar are for sure helping verbs, but really they aren't used that much in Spanish. Here is an article that explains a little bit of this kind of stuff, it will give you a leg to stand on if you want to google more information. As HotChickCD pointed out, "poder" can be used here much like the helping verbs here are used, but in Spanish it isn't actually a helping verb.
I can - Podré :S
You can say "De acuerdo" and it's also a "perfect for almost any circumstance response" - it doesn't just mean I agree, it also means, OK, sure, yeah right on.