Verbseoul.
하다 verb (adj)

대단하다 conjugation (daedanhada, to be great, huge, immense, enormous, tremendous)

To say to be great, huge, immense, enormous, tremendous politely in the present tense, use 대단해요 (dae-dahn-hae-yoh) · daedanhaeyo. Below is the full conjugation of 대단하다 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
대단해
dae-dahn-hae
daedanhae
대단해요
dae-dahn-hae-yoh
daedanhaeyo
대단합니다
dae-dahn-hahm-nee-dah
daedanhamnida
Past
대단했어
dae-dahn-hae-ssuh
daedanhaesseo
대단했어요
dae-dahn-hae-ssuh-yoh
daedanhaesseoyo
대단했습니다
dae-dahn-hae-sseum-nee-dah
daedanhaesseumnida
Future
대단할 거야
dae-dahn-hahl guh-yah
daedanhal geoya
대단할 거예요
dae-dahn-hahl guh-yae-yoh
daedanhal geoyeyo
대단할 겁니다
dae-dahn-hahl guhm-nee-dah
daedanhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
대단하세요
dae-dahn-hah-sae-yoh
daedanhaseyo
Suggestion / Let's Polite (요)
대단해요
dae-dahn-hae-yoh
daedanhaeyo
Question Polite (요)
대단해요?
dae-dahn-hae-yoh-?
daedanhaeyo?
Connective "and" — (고)
대단하고
dae-dahn-hah-goh
daedanhago
Conditional "if" — (면)
대단하면
dae-dahn-hah-myuhn
daedanhamyeon
Progressive (고 있어요)
대단하고 있어요
dae-dahn-hah-goh ee-ssuh-yoh
daedanhago isseoyo
Want to (고 싶어요)
대단하고 싶어요
dae-dahn-hah-goh shee-puh-yoh
daedanhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
대단할 수 있어요
dae-dahn-hahl soo ee-ssuh-yoh
daedanhal su isseoyo
Because / So (아/어서)
대단해서
dae-dahn-hae-suh
daedanhaeseo
Noun form — (기)
대단하기
dae-dahn-hah-gee
daedanhagi
Noun form — (음)
대단함
dae-dahn-hahm
daedanham