Let's learn about "어젯밤에는 잠을 설쳤다"

어젯밤에는 잠을 설쳤다 : I couldn't sleep well last night

ex)

A. 너 오늘 엄청 피곤해 보인다 : You look very tired today

B. 어젯밤에는 잠을 설쳤거든 : I couldn't sleep well last night

[other expressions]

- 어젯밤에는 잠을 설쳤다. (to younger people or friends)

- 어젯밤에는 잠을 설쳤네. (to younger people or friends)

- 어젯밤에는 잠을 설쳤어. (to younger people or friends)

- 어젯밤에는 잠을 설쳤네요. (honourific by '요')

- 어젯밤에는 잠을 설쳤어요. (honourific by '요')

- 어젯밤에는 잠을 설쳤습니다. (formal; more honourific by '스')

[explanations]

* 어젯밤 : last night <-- 어제(yesterday) + -ㅅ(a suffix should be inserted when a noun and a noun concatenated togther) + 밤(night)

* -에 : a time suffix

* -는 : a particle emphsizes -에

* 설치다 : (1) [=날뛰다] run wild, be unruly (2) [as the phrase of "잠을 설치다] can't sleep well

- 방에서 너무 설치지 마라. 아랫층에서 민원 들어온다 : Don't run too much wild in the room. Complaints are coming from downstairs

- 잠을 설치다 : sleep fitfully; do not get a good night's sleep; do not sleep well at night

* 설쳤다 : past tense of 설치다 by '-였-'

* 설쳤습니다 : 설쳤(the stem of 설쳤다) + -스(a suffix makes a verv more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* a verb + -다 / -네 / -어 : a non-honourific descriptive verb ending suffix

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

* a verb +  -습니다 / -ㅂ니다 : an honourific descriptive verb ending suffix by '스' / '-ㅂ'