Verbseoul.
하다 verb
개봉하다gaebonghadato break open (a seal)

To say to break open (a seal) politely in the present tense, use 개봉해요 (gae-bohng-hae-yoh). Below is the full conjugation of 개봉하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
개봉해
gae-bohng-hae
개봉해요
gae-bohng-hae-yoh
개봉합니다
gae-bohng-hahm-nee-dah
Past
개봉했어
gae-bohng-hae-ssuh
개봉했어요
gae-bohng-hae-ssuh-yoh
개봉했습니다
gae-bohng-hae-sseum-nee-dah
Future
개봉할 거야
gae-bohng-hahl- -guh-yah
개봉할 거예요
gae-bohng-hahl- -guh-yae-yoh
개봉할 겁니다
gae-bohng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
개봉하세요
gae-bohng-hah-sae-yoh
Suggestion / Let's Polite (요)
개봉해요
gae-bohng-hae-yoh
Question Polite (요)
개봉해요?
gae-bohng-hae-yoh-?
Connective “and” — (고)
개봉하고
gae-bohng-hah-goh
Conditional “if” — (면)
개봉하면
gae-bohng-hah-myuhn
Noun form — (기)
개봉함
gae-bohng-hahm