Verbseoul.
ㅎ irregular (adj)
아심턔닣다asimtyaenitdato be thankful for a favor someone has done

To say to be thankful for a favor someone has done politely in the present tense, use 아심턔니여요 (ah-sheem-tyae-nee-yuh-yoh). Below is the full conjugation of 아심턔닣다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
아심턔니여
ah-sheem-tyae-nee-yuh
아심턔니여요
ah-sheem-tyae-nee-yuh-yoh
아심턔닣습니다
ah-sheem-tyae-nee-sseum-nee-dah
Past
아심턔니였어
ah-sheem-tyae-nee-yuh-ssuh
아심턔니였어요
ah-sheem-tyae-nee-yuh-ssuh-yoh
아심턔니였습니다
ah-sheem-tyae-nee-yuh-sseum-nee-dah
Future
아심턔닐 거야
ah-sheem-tyae-neel- -guh-yah
아심턔닐 거예요
ah-sheem-tyae-neel- -guh-yae-yoh
아심턔닐 겁니다
ah-sheem-tyae-neel- -guhm-nee-dah

Other useful forms

Command Polite (세요)
아심턔니세요
ah-sheem-tyae-nee-sae-yoh
Suggestion / Let's Polite (요)
아심턔니여요
ah-sheem-tyae-nee-yuh-yoh
Question Polite (요)
아심턔니여요?
ah-sheem-tyae-nee-yuh-yoh-?
Connective “and” — (고)
아심턔닣고
ah-sheem-tyae-nee-koh
Conditional “if” — (면)
아심턔니면
ah-sheem-tyae-nee-myuhn
Noun form — (기)
아심턔님
ah-sheem-tyae-neem