Verbseoul.
하다 verb
담보하다dambohadato guarantee

To say to guarantee politely in the present tense, use 담보해요 (dahm-boh-hae-yoh). Below is the full conjugation of 담보하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
담보해
dahm-boh-hae
담보해요
dahm-boh-hae-yoh
담보합니다
dahm-boh-hahm-nee-dah
Past
담보했어
dahm-boh-hae-ssuh
담보했어요
dahm-boh-hae-ssuh-yoh
담보했습니다
dahm-boh-hae-sseum-nee-dah
Future
담보할 거야
dahm-boh-hahl- -guh-yah
담보할 거예요
dahm-boh-hahl- -guh-yae-yoh
담보할 겁니다
dahm-boh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
담보하세요
dahm-boh-hah-sae-yoh
Suggestion / Let's Polite (요)
담보해요
dahm-boh-hae-yoh
Question Polite (요)
담보해요?
dahm-boh-hae-yoh-?
Connective “and” — (고)
담보하고
dahm-boh-hah-goh
Conditional “if” — (면)
담보하면
dahm-boh-hah-myuhn
Noun form — (기)
담보함
dahm-boh-hahm