Let's learn about "갑자기, 왜?"

갑자기, 왜? = 왜, 갑자기? : All of a sudden, why?

[other expressions]

- 갑자기, 왜? (to younger poeple or friends)

- 갑자기, 왜요? (honourific by '-요')

- 갑자기, 왜입니까? (formal; honourific by '-ㅂ')

<a little more emphatic>

- 왜, 갑자기? (to younger poeple or friends)

- 왜요, 갑자기? (honourific by '-요')

- 왜입니까, 갑자기?  (formal; honourific by '-ㅂ')

[expalanations]

* 갑자기 : all of a sudden

* 왜? : why

* 왜요? : 왜 + -요(an honourific interrogative ending suffix)

* 왜입니까? : 왜 + -이다(be) + -ㅂ니까(an honourific interrogative verb ending suffix by '-ㅂ')