Verbseoul.
하다 verb (adj)

당연하다 conjugation (dangyeonhada, to be reasonable or natural)

To say to be reasonable or natural politely in the present tense, use 당연해요 (dahng-yuhn-hae-yoh) · dangyeonhaeyo. Below is the full conjugation of 당연하다 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
당연해
dahng-yuhn-hae
dangyeonhae
당연해요
dahng-yuhn-hae-yoh
dangyeonhaeyo
당연합니다
dahng-yuhn-hahm-nee-dah
dangyeonhamnida
Past
당연했어
dahng-yuhn-hae-ssuh
dangyeonhaesseo
당연했어요
dahng-yuhn-hae-ssuh-yoh
dangyeonhaesseoyo
당연했습니다
dahng-yuhn-hae-sseum-nee-dah
dangyeonhaesseumnida
Future
당연할 거야
dahng-yuhn-hahl guh-yah
dangyeonhal geoya
당연할 거예요
dahng-yuhn-hahl guh-yae-yoh
dangyeonhal geoyeyo
당연할 겁니다
dahng-yuhn-hahl guhm-nee-dah
dangyeonhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
당연하세요
dahng-yuhn-hah-sae-yoh
dangyeonhaseyo
Suggestion / Let's Polite (요)
당연해요
dahng-yuhn-hae-yoh
dangyeonhaeyo
Question Polite (요)
당연해요?
dahng-yuhn-hae-yoh-?
dangyeonhaeyo?
Connective "and" — (고)
당연하고
dahng-yuhn-hah-goh
dangyeonhago
Conditional "if" — (면)
당연하면
dahng-yuhn-hah-myuhn
dangyeonhamyeon
Progressive (고 있어요)
당연하고 있어요
dahng-yuhn-hah-goh ee-ssuh-yoh
dangyeonhago isseoyo
Want to (고 싶어요)
당연하고 싶어요
dahng-yuhn-hah-goh shee-puh-yoh
dangyeonhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
당연할 수 있어요
dahng-yuhn-hahl soo ee-ssuh-yoh
dangyeonhal su isseoyo
Because / So (아/어서)
당연해서
dahng-yuhn-hae-suh
dangyeonhaeseo
Noun form — (기)
당연하기
dahng-yuhn-hah-gee
dangyeonhagi
Noun form — (음)
당연함
dahng-yuhn-hahm
dangyeonham