Verbseoul.
하다 verb
제안하다jeanhadato propose, to suggest, to offer (to suggest a plan or course of actio

To say to propose, to suggest, to offer (to suggest a plan or course of actio politely in the present tense, use 제안해요 (chae-ahn-hae-yoh). Below is the full conjugation of 제안하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
제안해
chae-ahn-hae
제안해요
chae-ahn-hae-yoh
제안합니다
chae-ahn-hahm-nee-dah
Past
제안했어
chae-ahn-hae-ssuh
제안했어요
chae-ahn-hae-ssuh-yoh
제안했습니다
chae-ahn-hae-sseum-nee-dah
Future
제안할 거야
chae-ahn-hahl- -guh-yah
제안할 거예요
chae-ahn-hahl- -guh-yae-yoh
제안할 겁니다
chae-ahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
제안하세요
chae-ahn-hah-sae-yoh
Suggestion / Let's Polite (요)
제안해요
chae-ahn-hae-yoh
Question Polite (요)
제안해요?
chae-ahn-hae-yoh-?
Connective “and” — (고)
제안하고
chae-ahn-hah-goh
Conditional “if” — (면)
제안하면
chae-ahn-hah-myuhn
Noun form — (기)
제안함
chae-ahn-hahm