Verbseoul.
하다 verb

반대하다 conjugation (bandaehada, to oppose)

To say to oppose politely in the present tense, use 반대해요 (bahn-dae-hae-yoh) · bandaehaeyo. Below is the full conjugation of 반대하다 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
반대해
bahn-dae-hae
bandaehae
반대해요
bahn-dae-hae-yoh
bandaehaeyo
반대합니다
bahn-dae-hahm-nee-dah
bandaehamnida
Past
반대했어
bahn-dae-hae-ssuh
bandaehaesseo
반대했어요
bahn-dae-hae-ssuh-yoh
bandaehaesseoyo
반대했습니다
bahn-dae-hae-sseum-nee-dah
bandaehaesseumnida
Future
반대할 거야
bahn-dae-hahl guh-yah
bandaehal geoya
반대할 거예요
bahn-dae-hahl guh-yae-yoh
bandaehal geoyeyo
반대할 겁니다
bahn-dae-hahl guhm-nee-dah
bandaehal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
반대하세요
bahn-dae-hah-sae-yoh
bandaehaseyo
Suggestion / Let's Polite (요)
반대해요
bahn-dae-hae-yoh
bandaehaeyo
Question Polite (요)
반대해요?
bahn-dae-hae-yoh-?
bandaehaeyo?
Connective "and" — (고)
반대하고
bahn-dae-hah-goh
bandaehago
Conditional "if" — (면)
반대하면
bahn-dae-hah-myuhn
bandaehamyeon
Progressive (고 있어요)
반대하고 있어요
bahn-dae-hah-goh ee-ssuh-yoh
bandaehago isseoyo
Want to (고 싶어요)
반대하고 싶어요
bahn-dae-hah-goh shee-puh-yoh
bandaehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
반대할 수 있어요
bahn-dae-hahl soo ee-ssuh-yoh
bandaehal su isseoyo
Because / So (아/어서)
반대해서
bahn-dae-hae-suh
bandaehaeseo
Noun form — (기)
반대하기
bahn-dae-hah-gee
bandaehagi
Noun form — (음)
반대함
bahn-dae-hahm
bandaeham