Verbseoul.
하다 verb
항의하다hanguihadato protest, to complain

To say to protest, to complain politely in the present tense, use 항의해요 (hahng-ui-hae-yoh). Below is the full conjugation of 항의하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
항의해
hahng-ui-hae
항의해요
hahng-ui-hae-yoh
항의합니다
hahng-ui-hahm-nee-dah
Past
항의했어
hahng-ui-hae-ssuh
항의했어요
hahng-ui-hae-ssuh-yoh
항의했습니다
hahng-ui-hae-sseum-nee-dah
Future
항의할 거야
hahng-ui-hahl- -guh-yah
항의할 거예요
hahng-ui-hahl- -guh-yae-yoh
항의할 겁니다
hahng-ui-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
항의하세요
hahng-ui-hah-sae-yoh
Suggestion / Let's Polite (요)
항의해요
hahng-ui-hae-yoh
Question Polite (요)
항의해요?
hahng-ui-hae-yoh-?
Connective “and” — (고)
항의하고
hahng-ui-hah-goh
Conditional “if” — (면)
항의하면
hahng-ui-hah-myuhn
Noun form — (기)
항의함
hahng-ui-hahm