Verbseoul.
regular
그만두다geumandudaTo quit

To say To quit politely in the present tense, use 그만둬요 (geu-mahn-dwuh-yoh). Below is the full conjugation of 그만두다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
그만둬
geu-mahn-dwuh
그만둬요
geu-mahn-dwuh-yoh
그만둡니다
geu-mahn-doom-nee-dah
Past
그만뒀어
geu-mahn-dwuh-ssuh
그만뒀어요
geu-mahn-dwuh-ssuh-yoh
그만뒀습니다
geu-mahn-dwuh-sseum-nee-dah
Future
그만둘 거야
geu-mahn-dool- -guh-yah
그만둘 거예요
geu-mahn-dool- -guh-yae-yoh
그만둘 겁니다
geu-mahn-dool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
그만두세요
geu-mahn-doo-sae-yoh
Suggestion / Let's Polite (요)
그만둬요
geu-mahn-dwuh-yoh
Question Polite (요)
그만둬요?
geu-mahn-dwuh-yoh-?
Connective “and” — (고)
그만두고
geu-mahn-doo-goh
Conditional “if” — (면)
그만두면
geu-mahn-doo-myuhn
Noun form — (기)
그만둠
geu-mahn-doom