Let's learn about "별 거 아니야"

별 거 아니야 : It was nothing / No problem / It’s not a big deal

[other expressions]

- 별 거 아니다. (to younger people or friends)

- 별 거 아니네. (to younger people or friends)

- 별 거 아니야. (to younger people or friends)

- 별 거 아니네요. (honourific by '-요')

- 별 거 아니에요. (honourific by '-요')

- 별 거 아닙니다. (formal; honourific by '-ㅂ')

[explanations]

* 별 : [=보통과 다른] different; not normal

* 거 : a short form of 것(a thing)

* -가 : a suffix makes 별 거 the topic of the sentence after a word ends a vowel; this omitted

* -이 : a suffix makes 별 것 the topic of the sentence after a word ends a consonant; this omitted

* 아니다 : be not

* 아닙니다 : 아니다 + -ㅂ니다

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

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