사인해
sah-een-hae
sainhae
사인하다
To say to sign (to write one's signature on a document) politely in the present tense, use 사인해요 (sah-een-hae-yoh) · sainhaeyo. Below is the full conjugation of 사인하다 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 | 사인해요 sah-een-hae-yoh sainhaeyo | 사인합니다 sah-een-hahm-nee-dah sainhamnida | |
| Past | 사인했어 sah-een-hae-ssuh sainhaesseo | 사인했어요 sah-een-hae-ssuh-yoh sainhaesseoyo | 사인했습니다 sah-een-hae-sseum-nee-dah sainhaesseumnida |
| Future | 사인할 거야 sah-een-hahl guh-yah sainhal geoya | 사인할 거예요 sah-een-hahl guh-yae-yoh sainhal geoyeyo | 사인할 겁니다 sah-een-hahl guhm-nee-dah sainhal geomnida |
Other useful forms
Honorific / Command Polite (-(으)세요)
사인하세요
sah-een-hah-sae-yoh
sainhaseyo
Suggestion / Let's Polite (요)
사인해요
sah-een-hae-yoh
sainhaeyo
Question Polite (요)
사인해요?
sah-een-hae-yoh-?
sainhaeyo?
Connective "and" — (고)
사인하고
sah-een-hah-goh
sainhago
Conditional "if" — (면)
사인하면
sah-een-hah-myuhn
sainhamyeon
Progressive (고 있어요)
사인하고 있어요
sah-een-hah-goh ee-ssuh-yoh
sainhago isseoyo
Want to (고 싶어요)
사인하고 싶어요
sah-een-hah-goh shee-puh-yoh
sainhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
사인할 수 있어요
sah-een-hahl soo ee-ssuh-yoh
sainhal su isseoyo
Because / So (아/어서)
사인해서
sah-een-hae-suh
sainhaeseo
Noun form — (기)
사인하기
sah-een-hah-gee
sainhagi
Noun form — (음)
사인함
sah-een-hahm
sainham