Verbseoul.
하다 verb
개선하다gaeseonhadato improve, to ameliorate

To say to improve, to ameliorate politely in the present tense, use 개선해요 (gae-suhn-hae-yoh). Below is the full conjugation of 개선하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
개선해
gae-suhn-hae
개선해요
gae-suhn-hae-yoh
개선합니다
gae-suhn-hahm-nee-dah
Past
개선했어
gae-suhn-hae-ssuh
개선했어요
gae-suhn-hae-ssuh-yoh
개선했습니다
gae-suhn-hae-sseum-nee-dah
Future
개선할 거야
gae-suhn-hahl- -guh-yah
개선할 거예요
gae-suhn-hahl- -guh-yae-yoh
개선할 겁니다
gae-suhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
개선하세요
gae-suhn-hah-sae-yoh
Suggestion / Let's Polite (요)
개선해요
gae-suhn-hae-yoh
Question Polite (요)
개선해요?
gae-suhn-hae-yoh-?
Connective “and” — (고)
개선하고
gae-suhn-hah-goh
Conditional “if” — (면)
개선하면
gae-suhn-hah-myuhn
Noun form — (기)
개선함
gae-suhn-hahm