Let's learn about "미친 거니?"

미친 거니? = 미쳤니? : (1) Are you crazy? (2) How did you do such a stupid thing?

[other expressions]

- 미친 거니? (to younger people or friends)

- 미친 거냐? (to younger people or friends)

- 미친 거야? (to younger people or friends)

- 미친 거예요? (to younger people or friends)

- 미친 겁니까? (formal; honourific by ‘-ㅂ’)

- 미쳤니? (to younger people or friends)

- 미쳤나? (to younger people or friends)

- 미쳤냐? (to younger people or friends)

- 미쳤어? (to younger people or friends)

- 미쳤습니까? (formal; more honourific by ‘-ㅅ’)

[explanations]

* 미친 : mad; crazy; insane; crackbrained; cracked

* 거니? : a short form of 것이니?

* 거냐? : a short form of 것이냐?

* 거야? : a short form of 것이야?

* 거예요? : a short form of 것이에요?

* 겁니까? : a short form of 것입니까?

* 거 : a short form of 것(thing)

* 이다 : be

* 미치다 : [=정신이상이 되다] go mad[out of one's mind]; become[go] insane[crazy]; lose one's head[wits / mind]; go crackers[nuts]

* 미쳤다 : past tense or present perfect of 미치다 by '-였-'

* 미쳤습니까? : 미쳤(the stem of 미쳤다) + -스(s suffix makes a verb more honourific) + -ㅂ니까?(an honourific interrogative verb ending suffix by ‘-ㅂ’)

* a verb + -니? / -나? / -냐? / -야? / -어? : a non-honourific interrogative verb ending suffix

* a verb + -나? / -어? + -요 : an honourific verb ending suffix

* a verb + -습니까? / -ㅂ니까? : an honourific interrogative verb ending suffix by ‘스-‘ / ‘-ㅂ’