Let's learn about "나 가야 돼"

나 가야 돼 : I've gotta go; I have to go

[other expressions]

- 나 가야  된다. (to younger people or friends)

- 나 가야  되네. (to younger people or friends)

- 나 가야  돼. (to younger people or friends)

- 저 가야  되네요. (honourific by ‘-요’)

- 저 가야  돼요. (honourific by ‘-요’)

- 저 가야  됩니다. (formal; honourific by ‘ㅂ’)

[explanations]

* 나 : I (non-honourific word)

* 저 : I (honourific word)

* -는 : a particle makes 나 / 저 subjective after a word ends in a vowel; this omitted

* 가다 : go

* 가야 : 가(the stem of 가다) + -야(a connection suffix between two verbs; this used as the form of -야 하다 or -야 되다)

* 되다 : (1) become (2) can; be able to do (3) [-야 되다] have to; should; must

* 된다 : present form of 되다 by '-ㄴ'

* -야 하다 = -야 되다 : have to do; must do; should do

* 돼 : 되(the stem of 되다) + -어(a non-honourific descriptive verb ending suffix)

* 됩니다 : 되(the stem of 되다) + -ㅂ니다(an honourific descriptive verb ending suffix by ‘ㅂ’)

* a verb + -어 / -네 / -다 : a non-honourific descriptive verb ending suffix

* a verb + -어 / -네 + -요 : honourific verb ending suffix

* a verb + -ㅂ니다 : an honourific descriptive verb ending suffix by ‘-ㅂ’