Verbseoul.
하다 verb (adj)

근면하다 conjugation (geunmyeonhada, diligent, industrious, hardworking)

To say diligent, industrious, hardworking politely in the present tense, use 근면해요 (geun-myuhn-hae-yoh) · geunmyeonhaeyo. Below is the full conjugation of 근면하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb (adj)): 하다 adjectives use the same verb 하다 as a suffix to turn descriptive nouns into predicates (행복하다 = to be happy). They conjugate identically to 하다 verbs: the 하 contracts before -아/-어 suffixes to give 해. 행복해요, 행복했어요, 행복합니다. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
근면해
geun-myuhn-hae
geunmyeonhae
근면해요
geun-myuhn-hae-yoh
geunmyeonhaeyo
근면합니다
geun-myuhn-hahm-nee-dah
geunmyeonhamnida
Past
근면했어
geun-myuhn-hae-ssuh
geunmyeonhaesseo
근면했어요
geun-myuhn-hae-ssuh-yoh
geunmyeonhaesseoyo
근면했습니다
geun-myuhn-hae-sseum-nee-dah
geunmyeonhaesseumnida
Future
근면할 거야
geun-myuhn-hahl guh-yah
geunmyeonhal geoya
근면할 거예요
geun-myuhn-hahl guh-yae-yoh
geunmyeonhal geoyeyo
근면할 겁니다
geun-myuhn-hahl guhm-nee-dah
geunmyeonhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
근면하세요
geun-myuhn-hah-sae-yoh
geunmyeonhaseyo
Suggestion / Let's Polite (요)
근면해요
geun-myuhn-hae-yoh
geunmyeonhaeyo
Question Polite (요)
근면해요?
geun-myuhn-hae-yoh-?
geunmyeonhaeyo?
Connective "and" — (고)
근면하고
geun-myuhn-hah-goh
geunmyeonhago
Conditional "if" — (면)
근면하면
geun-myuhn-hah-myuhn
geunmyeonhamyeon
Progressive (고 있어요)
근면하고 있어요
geun-myuhn-hah-goh ee-ssuh-yoh
geunmyeonhago isseoyo
Want to (고 싶어요)
근면하고 싶어요
geun-myuhn-hah-goh shee-puh-yoh
geunmyeonhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
근면할 수 있어요
geun-myuhn-hahl soo ee-ssuh-yoh
geunmyeonhal su isseoyo
Because / So (아/어서)
근면해서
geun-myuhn-hae-suh
geunmyeonhaeseo
Noun form — (기)
근면하기
geun-myuhn-hah-gee
geunmyeonhagi
Noun form — (음)
근면함
geun-myuhn-hahm
geunmyeonham