Let's learn about "좋았어"

좋았어 : (1) That's nice (2) [=잘했어] good job

[other expressions]

- 좋았네. (to younger people or friends)

- 좋았어. (to younger people or friends)

- 좋았어요. (honourific by '-요')

- 좋았습니다. (formal; more honourific by '스')

- 잘했다. (to younger people or friends)

- 잘했네. (to younger people or friends)

- 잘했어. (to younger people or friends)

- 잘했어요. (honourific by '-요')

- 잘했습니다. (formal; more honourific by '스')

[explanations]

* 좋은 : (1) good (2) nice

* 좋다 : [Pronunciation: 조타] a verb form of 좋은

* 잘하다 : do well <-- 잘(well) + 하다(do)

* 잘했다 : past tense of 잘하다 by '-었-'

* 좋습니다 : 좋(the stem of 좋다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific verb ending suffix by ‘-ㅂ’)

* 잘했습니다 : 잘했(the stem of 잘했다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific verb ending suffix by ‘-ㅂ’)

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

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

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