Verbseoul.
하다 verb (adj)
단순하다dansunhadato be simple

To say to be simple politely in the present tense, use 단순해요 (dahn-soon-hae-yoh). Below is the full conjugation of 단순하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
단순해
dahn-soon-hae
단순해요
dahn-soon-hae-yoh
단순합니다
dahn-soon-hahm-nee-dah
Past
단순했어
dahn-soon-hae-ssuh
단순했어요
dahn-soon-hae-ssuh-yoh
단순했습니다
dahn-soon-hae-sseum-nee-dah
Future
단순할 거야
dahn-soon-hahl- -guh-yah
단순할 거예요
dahn-soon-hahl- -guh-yae-yoh
단순할 겁니다
dahn-soon-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
단순하세요
dahn-soon-hah-sae-yoh
Suggestion / Let's Polite (요)
단순해요
dahn-soon-hae-yoh
Question Polite (요)
단순해요?
dahn-soon-hae-yoh-?
Connective “and” — (고)
단순하고
dahn-soon-hah-goh
Conditional “if” — (면)
단순하면
dahn-soon-hah-myuhn
Noun form — (기)
단순함
dahn-soon-hahm