What is 'for' in korean?
How do you say 'for' in korean? I learned that it's "위하다" but I've read that it's not often used in spoken language.
So how do you say it in korean, like here:

1) I bought food for my dog.
2) I found the song that i will use for my presentation.
3) Do you want me to do it for him?

Thank you.
And please provide more examples and necessary explanations.

감사합니다!

Question

What is 'for' in korean?
How do you say 'for' in korean? I learned that it's "위하다" but I've read that it's not often used in spoken language.
So how do you say it in korean, like here:

1) I bought food for my dog.
2) I found the song that i will use for my presentation.
3) Do you want me to do it for him?

Thank you.
And please provide more examples and necessary explanations.

감사합니다!

Answer

for = ~를 위해(서) 
The meaning is right but it's not usually spoken to the letter.
1) 나는 나의 강아지를 위해(for) 음식을 샀어. (This sentence is a little unusual..) → 나는 우리 강아지 주려고 음식을 샀어.(Free translation is more natural.)
2) 나는 프리젠테이션에서(for) 사용할 노래를 발견했어.
3) 너는 내가 그를 위해(for) 그것을 하길 원하니?