Let's learn about "내가 살게"

1) Normal sitiation

- 제가 살게요 : It's on me

2) Mostly when good things happen

- 제가 한턱 낼게요 = 제가 한턱 쏠게요 : I'll treat you (food)

3) Someone older than you

- 제가 대접할게요 : I'll treat you food

[other expressions]

- 내가 살게. (to younger people or friends)

- 제가 살게요. (honourific by '-요')

- 제가 사겠습니다. (formal; more honourific by '스')

- 내가 한턱 낼게. (to younger people or friends)

- 제가 한턱 낼게요. (honourific by '-요')

- 제가 한턱 내겠습니다. (formal; more honourific by '스')

- 내가 한턱 쏠게. (to younger people or friends)

- 제가 한턱 쏠게요. (honourific by '-요')

- 제가 한턱 쏘겠습니다. (formal; more honourific by '스')

- 내가 대접할게. (to younger people or friends)

- 제가 대접할게요. (honourific by '-요')

- 제가 대접하겠습니다. (formal; more honourific by '스')

[explanations]

* 내 : I (non-honourific word)

* 제 : I (honourific word)

* -가 : a particle makes 내 / 제 subjective after a word ends in a vowel

If you want to emphasize what, use 은 or 는.

If you want to emphasize who, use 이 or 가

* 사다 : (1) buy (2) treat somone in the sentence

* 살게 : 사(the stem of 사다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will)

* 살게요 : 사(the stem of 사다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will) + -요(an honourific verb ending suffix)

* 사겠습니다 : 사(the stem of 사다) + -겠(one's will) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* 한턱 : [=향응] an entertainment; a treat; [=향연] a feast

* 내다 : (1) give out (2) buy something for someone; treat someone

* 쏘다 : (1) shoot (2) buy something for someone; 

* 한턱 내다 = 한턱 쏘다 : treat someone

* 낼게 : 내(the stem of 내다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will)

* 낼게요 : 내(the stem of 내다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will) + -요(an honourific verb ending suffix)

* 내겠습니다 : 내(the stem of 내다) + -겠(one's will) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* 쏠게 : 쏘(the stem of 쏘다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will)

* 쏠게요 : 쏘(the stem of 쏘다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will) + -요(an honourific verb ending suffix)

* 쏘겠습니다 : 쏘(the stem of 쏘다) + -겠(one's will) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* 대접 : (1) big (soup) bowl (2) a treat

* 대접하다 : treat someone

* 대접할게 : 대접하(the stem of 대접하다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will)

* 대접할게요 : 대접하(the stem of 대접하다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will) + -요(an honourific verb ending suffix)

* 대접하겠습니다 : 대접하(the stem of 대접하다) + -겠(one's will) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)