Verbseoul.
하다 verb (adj)

방대하다 conjugation (bangdaehada, to be vast, to be enormous, to be massive)

To say to be vast, to be enormous, to be massive politely in the present tense, use 방대해요 (bahng-dae-hae-yoh) · bangdaehaeyo. Below is the full conjugation of 방대하다 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
방대해
bahng-dae-hae
bangdaehae
방대해요
bahng-dae-hae-yoh
bangdaehaeyo
방대합니다
bahng-dae-hahm-nee-dah
bangdaehamnida
Past
방대했어
bahng-dae-hae-ssuh
bangdaehaesseo
방대했어요
bahng-dae-hae-ssuh-yoh
bangdaehaesseoyo
방대했습니다
bahng-dae-hae-sseum-nee-dah
bangdaehaesseumnida
Future
방대할 거야
bahng-dae-hahl guh-yah
bangdaehal geoya
방대할 거예요
bahng-dae-hahl guh-yae-yoh
bangdaehal geoyeyo
방대할 겁니다
bahng-dae-hahl guhm-nee-dah
bangdaehal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
방대하세요
bahng-dae-hah-sae-yoh
bangdaehaseyo
Suggestion / Let's Polite (요)
방대해요
bahng-dae-hae-yoh
bangdaehaeyo
Question Polite (요)
방대해요?
bahng-dae-hae-yoh-?
bangdaehaeyo?
Connective "and" — (고)
방대하고
bahng-dae-hah-goh
bangdaehago
Conditional "if" — (면)
방대하면
bahng-dae-hah-myuhn
bangdaehamyeon
Progressive (고 있어요)
방대하고 있어요
bahng-dae-hah-goh ee-ssuh-yoh
bangdaehago isseoyo
Want to (고 싶어요)
방대하고 싶어요
bahng-dae-hah-goh shee-puh-yoh
bangdaehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
방대할 수 있어요
bahng-dae-hahl soo ee-ssuh-yoh
bangdaehal su isseoyo
Because / So (아/어서)
방대해서
bahng-dae-hae-suh
bangdaehaeseo
Noun form — (기)
방대하기
bahng-dae-hah-gee
bangdaehagi
Noun form — (음)
방대함
bahng-dae-hahm
bangdaeham