Verbseoul.
regular
덧붙이다deotbutidato attach (something to ...), to affix, to stick

To say to attach (something to ...), to affix, to stick politely in the present tense, use 덧붙여요 (duht-boo-tyuh-yoh). Below is the full conjugation of 덧붙이다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
덧붙여
duht-boo-tyuh
덧붙여요
duht-boo-tyuh-yoh
덧붙입니다
duht-boo-cheem-nee-dah
Past
덧붙였어
duht-boo-tyuh-ssuh
덧붙였어요
duht-boo-tyuh-ssuh-yoh
덧붙였습니다
duht-boo-tyuh-sseum-nee-dah
Future
덧붙일 거야
duht-boo-cheel- -guh-yah
덧붙일 거예요
duht-boo-cheel- -guh-yae-yoh
덧붙일 겁니다
duht-boo-cheel- -guhm-nee-dah

Other useful forms

Command Polite (세요)
덧붙이세요
duht-boo-chee-sae-yoh
Suggestion / Let's Polite (요)
덧붙여요
duht-boo-tyuh-yoh
Question Polite (요)
덧붙여요?
duht-boo-tyuh-yoh-?
Connective “and” — (고)
덧붙이고
duht-boo-chee-goh
Conditional “if” — (면)
덧붙이면
duht-boo-chee-myuhn
Noun form — (기)
덧붙임
duht-boo-cheem