Verbseoul.
하다 verb

확대하다 conjugation (hwakdaehada, to expand)

To say to expand politely in the present tense, use 확대해요 (hwahg-dae-hae-yoh) · hwakdaehaeyo. Below is the full conjugation of 확대하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
확대해
hwahg-dae-hae
hwakdaehae
확대해요
hwahg-dae-hae-yoh
hwakdaehaeyo
확대합니다
hwahg-dae-hahm-nee-dah
hwakdaehamnida
Past
확대했어
hwahg-dae-hae-ssuh
hwakdaehaesseo
확대했어요
hwahg-dae-hae-ssuh-yoh
hwakdaehaesseoyo
확대했습니다
hwahg-dae-hae-sseum-nee-dah
hwakdaehaesseumnida
Future
확대할 거야
hwahg-dae-hahl guh-yah
hwakdaehal geoya
확대할 거예요
hwahg-dae-hahl guh-yae-yoh
hwakdaehal geoyeyo
확대할 겁니다
hwahg-dae-hahl guhm-nee-dah
hwakdaehal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
확대하세요
hwahg-dae-hah-sae-yoh
hwakdaehaseyo
Suggestion / Let's Polite (요)
확대해요
hwahg-dae-hae-yoh
hwakdaehaeyo
Question Polite (요)
확대해요?
hwahg-dae-hae-yoh-?
hwakdaehaeyo?
Connective "and" — (고)
확대하고
hwahg-dae-hah-goh
hwakdaehago
Conditional "if" — (면)
확대하면
hwahg-dae-hah-myuhn
hwakdaehamyeon
Progressive (고 있어요)
확대하고 있어요
hwahg-dae-hah-goh ee-ssuh-yoh
hwakdaehago isseoyo
Want to (고 싶어요)
확대하고 싶어요
hwahg-dae-hah-goh shee-puh-yoh
hwakdaehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
확대할 수 있어요
hwahg-dae-hahl soo ee-ssuh-yoh
hwakdaehal su isseoyo
Because / So (아/어서)
확대해서
hwahg-dae-hae-suh
hwakdaehaeseo
Noun form — (기)
확대하기
hwahg-dae-hah-gee
hwakdaehagi
Noun form — (음)
확대함
hwahg-dae-hahm
hwakdaeham