Lo haré por tí
Why por here and not para? It IS FOR you? isn't like Para, for you? Not in exchange for, so I don't really get why.
7 Answers
I think lo haré por tí is something like "I'll do it because of you" whereas lo haré para tí means s.l "I'll do it for you", anyway I think they can be used interchangeably.
Yes, it is 'for' you or 'because' of you
ella lo hará por mí -> she'll do it for me
Lo traje para ti -> I brought it for you - I didn't buy it as a gift 'por tí', I bought it for you because you didn't have time and you're giving it to someone as a gift, for example.
lo compré por tí - bought it for you, I bought it as a gift for you.
For the same reason you say in English "for you" sometimes, and "to you" other times.
The problem is that in English we say " I will sing for John." Do we mean sing to him or sing in place of him. The only we we know which "for" we mean is from context. I will sing a song to John because he likes songs, or I will sing in place of John because he is sick and has a sore throat.
In Spanish they have two words for "for" > Para and Por' Cantaré para Juan = I will sing for John (because he can't) Cantaré por Juan =I will sing to John (because he will enjoy it.)
Lo haré para tí = I will make it for you (so you won't have to) Lo haré por tí = I will make it for you (to keep)
Ok, everyone: the word "ti" does not have an accent! Writing "tí" is an ortographic mistake.
Why por here and not para? It IS FOR you? isn't like Para, for you? Not in exchange for, so I don't really get why.
The "exchange" use is a very specific use that only comes up in very specific circumstances. The preposition "por" means "because (of)" 99% of the time (OK, I made up this statistic, but I bet it is very high nevertheless).
"I did it because of you" ("Lo hice por ti") means that the person is the reason why you did it, it shows your concern for this person. "I did it for you" ("Lo hice para ti") means that the other person is the recipient of whatever it is you are going to give him/her, but you still can add that you did it for him, but because of someone else. They are not the same, although they serve very similar purposes. Do you find it unnecessary to have two prepositions for this? Well... you use two in English too, so there you go!
Don't bother thinking about the "exchange" thing unless you are exchanging things (e.g. "esto por lo otro"): "por" is used to give reasons.
Before lazarus has a heart attack:
First person singular:
subject pronoun = yo
object pronoun = mí
possessive adjective = mi
The tilde differentiates the two otherwise similar words and the possesive adjective doesn't have one--yó is not a word.
Second person singular:
subject pronoun = tú
object pronoun = ti
possevive adjective = tu
The tilde differentiates the two otherwise similar words and the possesive adjective doesn't have one--tí is not a word.
Lo haré por tí = I'll do it for you = I'll do it on your behalf (it's your job, but I'll do it.)
Lo haré para tí = I'll do it for you = I'll do it for your benefit.
There could be a some overlap as at times it would to one's benefit if you did something on their behalf, right?
My two cents.