Verbseoul.
하다 verb
동맹하다dongmaenghadato form an alliance, union or league

To say to form an alliance, union or league politely in the present tense, use 동맹해요 (dohng-maeng-hae-yoh). Below is the full conjugation of 동맹하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
동맹해
dohng-maeng-hae
동맹해요
dohng-maeng-hae-yoh
동맹합니다
dohng-maeng-hahm-nee-dah
Past
동맹했어
dohng-maeng-hae-ssuh
동맹했어요
dohng-maeng-hae-ssuh-yoh
동맹했습니다
dohng-maeng-hae-sseum-nee-dah
Future
동맹할 거야
dohng-maeng-hahl- -guh-yah
동맹할 거예요
dohng-maeng-hahl- -guh-yae-yoh
동맹할 겁니다
dohng-maeng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
동맹하세요
dohng-maeng-hah-sae-yoh
Suggestion / Let's Polite (요)
동맹해요
dohng-maeng-hae-yoh
Question Polite (요)
동맹해요?
dohng-maeng-hae-yoh-?
Connective “and” — (고)
동맹하고
dohng-maeng-hah-goh
Conditional “if” — (면)
동맹하면
dohng-maeng-hah-myuhn
Noun form — (기)
동맹함
dohng-maeng-hahm