Let's learn about "꿈인가?"

꿈인가? : Is this a dream?

[other expressions]

- 꿈이니? (to younger people or friends)

- 꿈이냐? (to younger people or friends)

- 꿈이야? (to younger people or friends)

- 꿈인가? (to younger people or friends)

- 꿈이지? (honourific by ‘-요’)

- 꿈이에요? (honourific by ‘-요’)

- 꿈인가요? (honourific by ‘-요’)

- 꿈이지요? (honourific by ‘-요’)

- 꿈입니까? (formal; honourific by ‘-ㅂ’)

[explanations]

* 이게 : a short form of 이것이; this omitted

* 이것 : this

* -이 : a particle makes 이것 the topic of the sentence after a word ends in a vowel

* 꿈 : dream

* 이다 : be

* a noun + -이니? / -이냐? / -인가? / -이지? : a non-honourific interrogative form of 이다

* a noun + -인가? / -이지? + -요 : an honourific verb ending suffix

* a noun + -이에요? / -입니까? : a honourific interrogative form of 이다 by '-요' / ‘-ㅂ’