Verbseoul.
하다 verb (adj)

납작하다 conjugation (napjakhada, to be flat, thin, low)

To say to be flat, thin, low politely in the present tense, use 납작해요 (nahp-chah-kae-yoh) · napjakaeyo. Below is the full conjugation of 납작하다 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
납작해
nahp-chah-kae
napjakae
납작해요
nahp-chah-kae-yoh
napjakaeyo
납작합니다
nahp-chah-kahm-nee-dah
napjakamnida
Past
납작했어
nahp-chah-kae-ssuh
napjakaesseo
납작했어요
nahp-chah-kae-ssuh-yoh
napjakaesseoyo
납작했습니다
nahp-chah-kae-sseum-nee-dah
napjakaesseumnida
Future
납작할 거야
nahp-chah-kahl guh-yah
napjakal geoya
납작할 거예요
nahp-chah-kahl guh-yae-yoh
napjakal geoyeyo
납작할 겁니다
nahp-chah-kahl guhm-nee-dah
napjakal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
납작하세요
nahp-chah-kah-sae-yoh
napjakaseyo
Suggestion / Let's Polite (요)
납작해요
nahp-chah-kae-yoh
napjakaeyo
Question Polite (요)
납작해요?
nahp-chah-kae-yoh-?
napjakaeyo?
Connective "and" — (고)
납작하고
nahp-chah-kah-goh
napjakago
Conditional "if" — (면)
납작하면
nahp-chah-kah-myuhn
napjakamyeon
Progressive (고 있어요)
납작하고 있어요
nahp-chah-kah-goh ee-ssuh-yoh
napjakago isseoyo
Want to (고 싶어요)
납작하고 싶어요
nahp-chah-kah-goh shee-puh-yoh
napjakago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
납작할 수 있어요
nahp-chah-kahl soo ee-ssuh-yoh
napjakal su isseoyo
Because / So (아/어서)
납작해서
nahp-chah-kae-suh
napjakaeseo
Noun form — (기)
납작하기
nahp-chah-kah-gee
napjakagi
Noun form — (음)
납작함
nahp-chah-kahm
napjakam