Verbseoul.
하다 verb (adj)
상당하다sangdanghadaremarkable

To say remarkable politely in the present tense, use 상당해요 (sahng-dahng-hae-yoh). Below is the full conjugation of 상당하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
상당해
sahng-dahng-hae
상당해요
sahng-dahng-hae-yoh
상당합니다
sahng-dahng-hahm-nee-dah
Past
상당했어
sahng-dahng-hae-ssuh
상당했어요
sahng-dahng-hae-ssuh-yoh
상당했습니다
sahng-dahng-hae-sseum-nee-dah
Future
상당할 거야
sahng-dahng-hahl- -guh-yah
상당할 거예요
sahng-dahng-hahl- -guh-yae-yoh
상당할 겁니다
sahng-dahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
상당하세요
sahng-dahng-hah-sae-yoh
Suggestion / Let's Polite (요)
상당해요
sahng-dahng-hae-yoh
Question Polite (요)
상당해요?
sahng-dahng-hae-yoh-?
Connective “and” — (고)
상당하고
sahng-dahng-hah-goh
Conditional “if” — (면)
상당하면
sahng-dahng-hah-myuhn
Noun form — (기)
상당함
sahng-dahng-hahm