Let'd learn about "오래 걸리다"

왜 그렇게 오래 걸렸니? = 왜 이렇게 오래 걸렸니?  : Why did it take so long?

[other expressions]

- 왜 그렇게 오래 걸렸니? (to younger people or friends)

- 왜 그렇게 오래 걸렸나? (to younger people or friends)

- 왜 그렇게 오래 걸렸냐? (to younger people or friends)

- 왜 그렇게 오래 걸렸어? (to younger people or friends)

- 왜 그렇게 오래 걸렸는가? (to younger people or friends)

- 왜 그렇게 오래 걸렸나요? (honourific by ‘-요’)

- 왜 그렇게 오래 걸렸어요? (honourific by ‘-요’)

- 왜 그렇게 오래 걸렸는가요? (honourific by ‘-요’)

- 왜 그렇게 오래 걸렸습니까? (formal; more honourific by ‘스’)

- 왜 그렇게 오래 걸리셨습니까? (formal; more honourific by ‘스’)

[explanations]

* 왜 : why

* 그렇게 : as such; like that; this can be replaced by 이렇게 in the sentence

* 오래 : long time

* 걸리다 : it takes (time)

* 걸렸다 : past tense of present perfect of 걸리다 by '-었-'

* 걸리셨다 : an honourific form of 걸렸다 by '-시-'; '-었-' changed into '-였-' for easy pronunciation

* 걸렸어? : 걸렸(the stem of 걸렸다) + -어?(a non-honourific interrogative verb ending suffix)

* 걸렸는가? : 걸렸(the stem of 걸렸다) + -ㄴ가?(a non-honourific interrogative verb ending suffix)

* 걸렸습니까? : 걸렸(the stem of 걸렸) + -스(a suffix makes a verb more honourific) + -ㅂ니까?(an  honourific interrogative verb ending suffix)

* 걸리셨습니까? : 걸리셨(the stem of 걸리셨다) + -스(a suffix makes a verb more honourific) + -ㅂ니까?(an  honourific interrogative verb ending suffix)

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

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

* a verb + -ㅂ니까? / -습니까? / -셨습니까? : an honourific interrgative verb ending suffix by ‘-ㅂ-‘ / '스'