Verbseoul.
하다 verb (adj)
간단하다gandanhadato be simple or straightforward

To say to be simple or straightforward politely in the present tense, use 간단해요 (gahn-dahn-hae-yoh). Below is the full conjugation of 간단하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
간단해
gahn-dahn-hae
간단해요
gahn-dahn-hae-yoh
간단합니다
gahn-dahn-hahm-nee-dah
Past
간단했어
gahn-dahn-hae-ssuh
간단했어요
gahn-dahn-hae-ssuh-yoh
간단했습니다
gahn-dahn-hae-sseum-nee-dah
Future
간단할 거야
gahn-dahn-hahl- -guh-yah
간단할 거예요
gahn-dahn-hahl- -guh-yae-yoh
간단할 겁니다
gahn-dahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
간단하세요
gahn-dahn-hah-sae-yoh
Suggestion / Let's Polite (요)
간단해요
gahn-dahn-hae-yoh
Question Polite (요)
간단해요?
gahn-dahn-hae-yoh-?
Connective “and” — (고)
간단하고
gahn-dahn-hah-goh
Conditional “if” — (면)
간단하면
gahn-dahn-hah-myuhn
Noun form — (기)
간단함
gahn-dahn-hahm