Verbseoul.
하다 verb

보장하다 conjugation (bojanghada, to guarantee, to assure)

To say to guarantee, to assure politely in the present tense, use 보장해요 (boh-chahng-hae-yoh) · bojanghaeyo. Below is the full conjugation of 보장하다 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
보장해
boh-chahng-hae
bojanghae
보장해요
boh-chahng-hae-yoh
bojanghaeyo
보장합니다
boh-chahng-hahm-nee-dah
bojanghamnida
Past
보장했어
boh-chahng-hae-ssuh
bojanghaesseo
보장했어요
boh-chahng-hae-ssuh-yoh
bojanghaesseoyo
보장했습니다
boh-chahng-hae-sseum-nee-dah
bojanghaesseumnida
Future
보장할 거야
boh-chahng-hahl guh-yah
bojanghal geoya
보장할 거예요
boh-chahng-hahl guh-yae-yoh
bojanghal geoyeyo
보장할 겁니다
boh-chahng-hahl guhm-nee-dah
bojanghal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
보장하세요
boh-chahng-hah-sae-yoh
bojanghaseyo
Suggestion / Let's Polite (요)
보장해요
boh-chahng-hae-yoh
bojanghaeyo
Question Polite (요)
보장해요?
boh-chahng-hae-yoh-?
bojanghaeyo?
Connective "and" — (고)
보장하고
boh-chahng-hah-goh
bojanghago
Conditional "if" — (면)
보장하면
boh-chahng-hah-myuhn
bojanghamyeon
Progressive (고 있어요)
보장하고 있어요
boh-chahng-hah-goh ee-ssuh-yoh
bojanghago isseoyo
Want to (고 싶어요)
보장하고 싶어요
boh-chahng-hah-goh shee-puh-yoh
bojanghago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
보장할 수 있어요
boh-chahng-hahl soo ee-ssuh-yoh
bojanghal su isseoyo
Because / So (아/어서)
보장해서
boh-chahng-hae-suh
bojanghaeseo
Noun form — (기)
보장하기
boh-chahng-hah-gee
bojanghagi
Noun form — (음)
보장함
boh-chahng-hahm
bojangham