Let's learn about "나 떠날 거야"

나 떠날 거야 : I'm leaving

[other expressions]

- 나 떠날 거다 = 나 떠날 것이다.  (to younger people or friends)

- 나 떠날 거네 = 나 떠날 것이네. (to younger people or friends)

- 나 떠날 거야 = 나 떠날 것이야. (to younger people or friends)

- 저 떠날 거네요 = 저 떠날 것이네요. (honourific by '-요')

- 저 떠날 거예요 = 저 떠날 것이에요. (honourific by '-요')

- 저 떠날 겁니다 = 저 떠날 것입니다. (formal; honourific by '-ㅂ')

[explanations]

* 나 : I (non-honourific word); this can be replaced by 난

* 저 : I (honourific word); this can be replaced by 전

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

* 난 : a short form of 나는

* 전 : a short form of 저는

* 떠나다 : leave

* 떠날 : 떠나(the stem of 떠나다) + -ㄹ(a suffix makes a verb future tense and attributive; this is used after a word ends in a consonant)

* 거 : a short form of 것(a thing)

* a word ends in a vowel + -다(a short form of 이다)

* a word ends in a consonant + -이다(br)

* -ㄹ 거다 = -ㄹ 것이다 : I will ~

* 겁니다 : 거 + -ㅂ니다

* 것입니다 : 것 + -입니다

* a noun + -다 / -네 / -야 / -이다 / -이네 / -이야 ; a non-honourific descriptive form of 이다

* a noun + -네 / -이네 + -요(an honourific ending suffix)

* a noun + -예요 / -이에요 / -ㅂ니다 / -입니다 : an honourific descriptive form of 이다 by '-요' / '-ㅂ