Let's learn about "이게 무슨 냄새야?"

이게 무슨 냄새야? : What's this smell?

[other expressions]

- 이게 무슨 냄새니? (to younger people or friends)

- 이게 무슨 냄새냐? (to younger people or friends)

- 이게 무슨 냄새야? (to younger people or friends)

- 이게 무슨 냄새인데? (to younger people or friends)

- 이게 무슨 냄새인데요? (honourific by ‘-요’)

- 이게 무슨 냄새예요? (honourific by ‘-요’)

- 이게 무슨 냄새입니까? (formal; honourific by ‘-ㅂ’)

[explanations]

* 이게 : a short form of 이것이

* 이것 : this (thing)

* -이 : a particle makes 이것 subject after a word ends in a consonant

* 이게 can be replaced by 이건

* 이건 : a short form of 이것은

* 이것 : this (thing)

* -은 : a particle makes 이것 subject after a word ends in a consonant

* 무슨 : what

* 냄새 : smell

* 이다 : be

* a noun ends in a vowel + -니? / -냐? / -야? / -ㄴ데 = a noun ends in a consonant + -이니? / -이냐? / -이야? / -인데? : a non-honourific interrogative form of 이다

* a noun + -ㄴ데? / -인데? + -요 : an honourific verb ending suffix

* a noun ends in a vowel + -ㅂ니까? = a noun ends in a consonant + -입니까? : a honourific interrogative form of 이다 by ‘-ㅂ’