발전해
bahl-chuhn-hae
baljeonhae
발전하다
To say to grow, to develop politely in the present tense, use 발전해요 (bahl-chuhn-hae-yoh) · baljeonhaeyo. Below is the full conjugation of 발전하다 across the three tenses and three everyday speech levels.
Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →
Conjugation table
pron. = pronunciation guide · RR = Revised Romanization
Highlighted = where the stem changes
| Tense | Casual (반말) | Polite (요) | Formal (합니다) |
|---|---|---|---|
| Present | 발전해요 bahl-chuhn-hae-yoh baljeonhaeyo | 발전합니다 bahl-chuhn-hahm-nee-dah baljeonhamnida | |
| Past | 발전했어 bahl-chuhn-hae-ssuh baljeonhaesseo | 발전했어요 bahl-chuhn-hae-ssuh-yoh baljeonhaesseoyo | 발전했습니다 bahl-chuhn-hae-sseum-nee-dah baljeonhaesseumnida |
| Future | 발전할 거야 bahl-chuhn-hahl guh-yah baljeonhal geoya | 발전할 거예요 bahl-chuhn-hahl guh-yae-yoh baljeonhal geoyeyo | 발전할 겁니다 bahl-chuhn-hahl guhm-nee-dah baljeonhal geomnida |
Other useful forms
Honorific / Command Polite (-(으)세요)
발전하세요
bahl-chuhn-hah-sae-yoh
baljeonhaseyo
Suggestion / Let's Polite (요)
발전해요
bahl-chuhn-hae-yoh
baljeonhaeyo
Question Polite (요)
발전해요?
bahl-chuhn-hae-yoh-?
baljeonhaeyo?
Connective "and" — (고)
발전하고
bahl-chuhn-hah-goh
baljeonhago
Conditional "if" — (면)
발전하면
bahl-chuhn-hah-myuhn
baljeonhamyeon
Progressive (고 있어요)
발전하고 있어요
bahl-chuhn-hah-goh ee-ssuh-yoh
baljeonhago isseoyo
Want to (고 싶어요)
발전하고 싶어요
bahl-chuhn-hah-goh shee-puh-yoh
baljeonhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
발전할 수 있어요
bahl-chuhn-hahl soo ee-ssuh-yoh
baljeonhal su isseoyo
Because / So (아/어서)
발전해서
bahl-chuhn-hae-suh
baljeonhaeseo
Noun form — (기)
발전하기
bahl-chuhn-hah-gee
baljeonhagi
Noun form — (음)
발전함
bahl-chuhn-hahm
baljeonham