Verbseoul.
하다 verb
귀국하다gwigukhadato return to one's country

To say to return to one's country politely in the present tense, use 귀국해요 (gwee-goo-kae-yoh). Below is the full conjugation of 귀국하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
귀국해
gwee-goo-kae
귀국해요
gwee-goo-kae-yoh
귀국합니다
gwee-goo-kahm-nee-dah
Past
귀국했어
gwee-goo-kae-ssuh
귀국했어요
gwee-goo-kae-ssuh-yoh
귀국했습니다
gwee-goo-kae-sseum-nee-dah
Future
귀국할 거야
gwee-goo-kahl- -guh-yah
귀국할 거예요
gwee-goo-kahl- -guh-yae-yoh
귀국할 겁니다
gwee-goo-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
귀국하세요
gwee-goo-kah-sae-yoh
Suggestion / Let's Polite (요)
귀국해요
gwee-goo-kae-yoh
Question Polite (요)
귀국해요?
gwee-goo-kae-yoh-?
Connective “and” — (고)
귀국하고
gwee-goo-kah-goh
Conditional “if” — (면)
귀국하면
gwee-goo-kah-myuhn
Noun form — (기)
귀국함
gwee-goo-kahm