Verbseoul.
하다 verb
악화하다akhwahadato worsen, to deteriorate, to degenerate, to take a turn for the worse

To say to worsen, to deteriorate, to degenerate, to take a turn for the worse politely in the present tense, use 악화해요 (ah-kwah-hae-yoh). Below is the full conjugation of 악화하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
악화해
ah-kwah-hae
악화해요
ah-kwah-hae-yoh
악화합니다
ah-kwah-hahm-nee-dah
Past
악화했어
ah-kwah-hae-ssuh
악화했어요
ah-kwah-hae-ssuh-yoh
악화했습니다
ah-kwah-hae-sseum-nee-dah
Future
악화할 거야
ah-kwah-hahl- -guh-yah
악화할 거예요
ah-kwah-hahl- -guh-yae-yoh
악화할 겁니다
ah-kwah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
악화하세요
ah-kwah-hah-sae-yoh
Suggestion / Let's Polite (요)
악화해요
ah-kwah-hae-yoh
Question Polite (요)
악화해요?
ah-kwah-hae-yoh-?
Connective “and” — (고)
악화하고
ah-kwah-hah-goh
Conditional “if” — (면)
악화하면
ah-kwah-hah-myuhn
Noun form — (기)
악화함
ah-kwah-hahm