Verbseoul.
하다 verb (adj)

광대하다 conjugation (gwangdaehada, vast, extensive)

To say vast, extensive politely in the present tense, use 광대해요 (gwahng-dae-hae-yoh) · gwangdaehaeyo. Below is the full conjugation of 광대하다 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
광대해
gwahng-dae-hae
gwangdaehae
광대해요
gwahng-dae-hae-yoh
gwangdaehaeyo
광대합니다
gwahng-dae-hahm-nee-dah
gwangdaehamnida
Past
광대했어
gwahng-dae-hae-ssuh
gwangdaehaesseo
광대했어요
gwahng-dae-hae-ssuh-yoh
gwangdaehaesseoyo
광대했습니다
gwahng-dae-hae-sseum-nee-dah
gwangdaehaesseumnida
Future
광대할 거야
gwahng-dae-hahl guh-yah
gwangdaehal geoya
광대할 거예요
gwahng-dae-hahl guh-yae-yoh
gwangdaehal geoyeyo
광대할 겁니다
gwahng-dae-hahl guhm-nee-dah
gwangdaehal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
광대하세요
gwahng-dae-hah-sae-yoh
gwangdaehaseyo
Suggestion / Let's Polite (요)
광대해요
gwahng-dae-hae-yoh
gwangdaehaeyo
Question Polite (요)
광대해요?
gwahng-dae-hae-yoh-?
gwangdaehaeyo?
Connective "and" — (고)
광대하고
gwahng-dae-hah-goh
gwangdaehago
Conditional "if" — (면)
광대하면
gwahng-dae-hah-myuhn
gwangdaehamyeon
Progressive (고 있어요)
광대하고 있어요
gwahng-dae-hah-goh ee-ssuh-yoh
gwangdaehago isseoyo
Want to (고 싶어요)
광대하고 싶어요
gwahng-dae-hah-goh shee-puh-yoh
gwangdaehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
광대할 수 있어요
gwahng-dae-hahl soo ee-ssuh-yoh
gwangdaehal su isseoyo
Because / So (아/어서)
광대해서
gwahng-dae-hae-suh
gwangdaehaeseo
Noun form — (기)
광대하기
gwahng-dae-hah-gee
gwangdaehagi
Noun form — (음)
광대함
gwahng-dae-hahm
gwangdaeham