Verbseoul.
하다 verb (adj)

반듯하다 conjugation (bandeuthada, to be straight)

To say to be straight politely in the present tense, use 반듯해요 (bahn-deu-tae-yoh) · bandeutaeyo. Below is the full conjugation of 반듯하다 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
반듯해
bahn-deu-tae
bandeutae
반듯해요
bahn-deu-tae-yoh
bandeutaeyo
반듯합니다
bahn-deu-tahm-nee-dah
bandeutamnida
Past
반듯했어
bahn-deu-tae-ssuh
bandeutaesseo
반듯했어요
bahn-deu-tae-ssuh-yoh
bandeutaesseoyo
반듯했습니다
bahn-deu-tae-sseum-nee-dah
bandeutaesseumnida
Future
반듯할 거야
bahn-deu-tahl guh-yah
bandeutal geoya
반듯할 거예요
bahn-deu-tahl guh-yae-yoh
bandeutal geoyeyo
반듯할 겁니다
bahn-deu-tahl guhm-nee-dah
bandeutal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
반듯하세요
bahn-deu-tah-sae-yoh
bandeutaseyo
Suggestion / Let's Polite (요)
반듯해요
bahn-deu-tae-yoh
bandeutaeyo
Question Polite (요)
반듯해요?
bahn-deu-tae-yoh-?
bandeutaeyo?
Connective "and" — (고)
반듯하고
bahn-deu-tah-goh
bandeutago
Conditional "if" — (면)
반듯하면
bahn-deu-tah-myuhn
bandeutamyeon
Progressive (고 있어요)
반듯하고 있어요
bahn-deu-tah-goh ee-ssuh-yoh
bandeutago isseoyo
Want to (고 싶어요)
반듯하고 싶어요
bahn-deu-tah-goh shee-puh-yoh
bandeutago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
반듯할 수 있어요
bahn-deu-tahl soo ee-ssuh-yoh
bandeutal su isseoyo
Because / So (아/어서)
반듯해서
bahn-deu-tae-suh
bandeutaeseo
Noun form — (기)
반듯하기
bahn-deu-tah-gee
bandeutagi
Noun form — (음)
반듯함
bahn-deu-tahm
bandeutam