Verbseoul.
regular
쌓다ssatdato stack up, to pile up

To say to stack up, to pile up politely in the present tense, use 쌓아요 (ssah-ah-yoh). Below is the full conjugation of 쌓다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
쌓아
ssah-ah
쌓아요
ssah-ah-yoh
쌓습니다
ssah-sseum-nee-dah
Past
쌓았어
ssah-ah-ssuh
쌓았어요
ssah-ah-ssuh-yoh
쌓았습니다
ssah-ah-sseum-nee-dah
Future
쌓을 거야
ssah-eul- -guh-yah
쌓을 거예요
ssah-eul- -guh-yae-yoh
쌓을 겁니다
ssah-eul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
쌓으세요
ssah-eu-sae-yoh
Suggestion / Let's Polite (요)
쌓아요
ssah-ah-yoh
Question Polite (요)
쌓아요?
ssah-ah-yoh-?
Connective “and” — (고)
쌓고
ssah-koh
Conditional “if” — (면)
쌓으면
ssah-eu-myuhn
Noun form — (기)
쌓음
ssah-eum