Let's learn about "왜 그러니?"

왜 그러니? : Why are you acting like that?

ex)

A. 왜 그러니? 내가 한 말에 불만있는 거니? : What's wrong? Are you unhappy with what I said?

B. 아니야. 내가 너한테 무슨 불만이 있겠어.. 니가 얼마나 나한테 잘해주는데... : No, I don't have any complaints about you. You're so nice to me

[other expressions]

- 왜 그러니? (to the younger people or friends)

- 왜 그러나? (to the younger people or friends)

- 왜 그러냐? (to the younger people or friends)

- 왜 그래? (to the younger people or friends)

- 왜 그러는가? (to the younger people or friends)

- 왜 그러지? (to the younger people or friends)

- 왜 그러나요? (honourific by '-요')

- 왜 그래요? (honourific by '-요')

- 왜 그러는가요? (honourific by '-요')

- 왜 그러지요? (honourific by '-요')

- 왜 그러죠? (honourific by '-요'; -죠? is a short form of -지요?)

- 왜 그럽니까? (formal; more honourific by '스')

[explanations]

* 왜 : why

* 그렇다 = 그러하다 = 그러다 : be such

* 그래? : 그러(the stem of 그러다; 러 and 어 contracted into 래) + -어(a non-honourific interrogative verb ending suffix)

* 그럽니까? : 그러(the stem of 그러다) + -ㅂ니까?(an honourific interrogative verb ending suffix)

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

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

* a verb + -ㅂ니까? : an honourific interrogative verb ending suffix by '-ㅂ'