Verbseoul.
하다 verb (adj)
타당하다tadanghadato be right, to be proper, to be appropriate

To say to be right, to be proper, to be appropriate politely in the present tense, use 타당해요 (tah-dahng-hae-yoh). Below is the full conjugation of 타당하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
타당해
tah-dahng-hae
타당해요
tah-dahng-hae-yoh
타당합니다
tah-dahng-hahm-nee-dah
Past
타당했어
tah-dahng-hae-ssuh
타당했어요
tah-dahng-hae-ssuh-yoh
타당했습니다
tah-dahng-hae-sseum-nee-dah
Future
타당할 거야
tah-dahng-hahl- -guh-yah
타당할 거예요
tah-dahng-hahl- -guh-yae-yoh
타당할 겁니다
tah-dahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
타당하세요
tah-dahng-hah-sae-yoh
Suggestion / Let's Polite (요)
타당해요
tah-dahng-hae-yoh
Question Polite (요)
타당해요?
tah-dahng-hae-yoh-?
Connective “and” — (고)
타당하고
tah-dahng-hah-goh
Conditional “if” — (면)
타당하면
tah-dahng-hah-myuhn
Noun form — (기)
타당함
tah-dahng-hahm