Let's learn about "내가 할게"

내가 할게 : I'll do it

[other expressions]

- 내가 할게. (to younger people or friends)

- 제가 할게요. (honourific by '-요')

- 제가 하겠습니다. (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

* 하다 : do

* 할게 : 하(the stem of 하다) + -ㄹ(a suffix makes a verb future tense) + -게(one's will)

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

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