Verbseoul.
하다 verb (adj)
안전하다anjeonhadato be safe

To say to be safe politely in the present tense, use 안전해요 (ahn-chuhn-hae-yoh). Below is the full conjugation of 안전하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
안전해
ahn-chuhn-hae
안전해요
ahn-chuhn-hae-yoh
안전합니다
ahn-chuhn-hahm-nee-dah
Past
안전했어
ahn-chuhn-hae-ssuh
안전했어요
ahn-chuhn-hae-ssuh-yoh
안전했습니다
ahn-chuhn-hae-sseum-nee-dah
Future
안전할 거야
ahn-chuhn-hahl- -guh-yah
안전할 거예요
ahn-chuhn-hahl- -guh-yae-yoh
안전할 겁니다
ahn-chuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
안전하세요
ahn-chuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
안전해요
ahn-chuhn-hae-yoh
Question Polite (요)
안전해요?
ahn-chuhn-hae-yoh-?
Connective “and” — (고)
안전하고
ahn-chuhn-hah-goh
Conditional “if” — (면)
안전하면
ahn-chuhn-hah-myuhn
Noun form — (기)
안전함
ahn-chuhn-hahm