맹세해
maeng-sae-hae
maengsehae
맹세하다
To say to swear politely in the present tense, use 맹세해요 (maeng-sae-hae-yoh) · maengsehaeyo. Below is the full conjugation of 맹세하다 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 | 맹세해요 maeng-sae-hae-yoh maengsehaeyo | 맹세합니다 maeng-sae-hahm-nee-dah maengsehamnida | |
| Past | 맹세했어 maeng-sae-hae-ssuh maengsehaesseo | 맹세했어요 maeng-sae-hae-ssuh-yoh maengsehaesseoyo | 맹세했습니다 maeng-sae-hae-sseum-nee-dah maengsehaesseumnida |
| Future | 맹세할 거야 maeng-sae-hahl guh-yah maengsehal geoya | 맹세할 거예요 maeng-sae-hahl guh-yae-yoh maengsehal geoyeyo | 맹세할 겁니다 maeng-sae-hahl guhm-nee-dah maengsehal geomnida |
Other useful forms
Honorific / Command Polite (-(으)세요)
맹세하세요
maeng-sae-hah-sae-yoh
maengsehaseyo
Suggestion / Let's Polite (요)
맹세해요
maeng-sae-hae-yoh
maengsehaeyo
Question Polite (요)
맹세해요?
maeng-sae-hae-yoh-?
maengsehaeyo?
Connective "and" — (고)
맹세하고
maeng-sae-hah-goh
maengsehago
Conditional "if" — (면)
맹세하면
maeng-sae-hah-myuhn
maengsehamyeon
Progressive (고 있어요)
맹세하고 있어요
maeng-sae-hah-goh ee-ssuh-yoh
maengsehago isseoyo
Want to (고 싶어요)
맹세하고 싶어요
maeng-sae-hah-goh shee-puh-yoh
maengsehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
맹세할 수 있어요
maeng-sae-hahl soo ee-ssuh-yoh
maengsehal su isseoyo
Because / So (아/어서)
맹세해서
maeng-sae-hae-suh
maengsehaeseo
Noun form — (기)
맹세하기
maeng-sae-hah-gee
maengsehagi
Noun form — (음)
맹세함
maeng-sae-hahm
maengseham