Let’s learn about "열심히 하다”

열심히 했습니다 : I worked hard / We worked hard

[other expressions]

- 열심히 했다. (to younger people or friends)

- 열심히 했네. (to younger people or friends)

- 열심히 했어. (to younger people or friends)

- 열심히 했네요. (honourific by ‘-요’)

- 열심히 했어요. (honourific by ‘-요’)

- 열심히 했습니다. (formal; honourific by ‘ㅂ’)

[explanations]

* 열심 : [Pronunciation: 열씸] [=열정] enthusiasm; [열기] zeal; ardor; eagerness; earnestness; keenness

- 공부에 열심이다 : I study hard

* 공부 / 배움 : studying

* 열심히 : [= 정신을 집중하여] zealously; enthusiastically; ardently; earnestly; warmly; passionately; whole-heartedly; in an earnest manner

- 그는 아주 열심히 일하는 사람이에요 : He's very hard working. 

- 우리는 오랜 시간을 열심히 일한 후에는 게을러 지려는 경향이 있다 : We tend to slack off after many hours of hard work. 

* 하다 : (1) do (2) work (3) study

* 했다 : past tense of 하다 by ‘-었-‘

* 했습니다 : 했(the stem of 했다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix by ‘-ㅂ’)

* 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’