Verbseoul.
하다 verb (adj)

확고하다 conjugation (hwakgohada, to be firm, to be staunch, to be adamant)

To say to be firm, to be staunch, to be adamant politely in the present tense, use 확고해요 (hwahg-ggoh-hae-yoh) · hwakkkohaeyo. Below is the full conjugation of 확고하다 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
확고해
hwahg-ggoh-hae
hwakkkohae
확고해요
hwahg-ggoh-hae-yoh
hwakkkohaeyo
확고합니다
hwahg-ggoh-hahm-nee-dah
hwakkkohamnida
Past
확고했어
hwahg-ggoh-hae-ssuh
hwakkkohaesseo
확고했어요
hwahg-ggoh-hae-ssuh-yoh
hwakkkohaesseoyo
확고했습니다
hwahg-ggoh-hae-sseum-nee-dah
hwakkkohaesseumnida
Future
확고할 거야
hwahg-ggoh-hahl guh-yah
hwakkkohal geoya
확고할 거예요
hwahg-ggoh-hahl guh-yae-yoh
hwakkkohal geoyeyo
확고할 겁니다
hwahg-ggoh-hahl guhm-nee-dah
hwakkkohal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
확고하세요
hwahg-ggoh-hah-sae-yoh
hwakkkohaseyo
Suggestion / Let's Polite (요)
확고해요
hwahg-ggoh-hae-yoh
hwakkkohaeyo
Question Polite (요)
확고해요?
hwahg-ggoh-hae-yoh-?
hwakkkohaeyo?
Connective "and" — (고)
확고하고
hwahg-ggoh-hah-goh
hwakkkohago
Conditional "if" — (면)
확고하면
hwahg-ggoh-hah-myuhn
hwakkkohamyeon
Progressive (고 있어요)
확고하고 있어요
hwahg-ggoh-hah-goh ee-ssuh-yoh
hwakkkohago isseoyo
Want to (고 싶어요)
확고하고 싶어요
hwahg-ggoh-hah-goh shee-puh-yoh
hwakkkohago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
확고할 수 있어요
hwahg-ggoh-hahl soo ee-ssuh-yoh
hwakkkohal su isseoyo
Because / So (아/어서)
확고해서
hwahg-ggoh-hae-suh
hwakkkohaeseo
Noun form — (기)
확고하기
hwahg-ggoh-hah-gee
hwakkkohagi
Noun form — (음)
확고함
hwahg-ggoh-hahm
hwakkkoham