Verbseoul.
하다 verb
같이하다gatihadato do together

To say to do together politely in the present tense, use 같이해요 (gah-chee-hae-yoh). Below is the full conjugation of 같이하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
같이해
gah-chee-hae
같이해요
gah-chee-hae-yoh
같이합니다
gah-chee-hahm-nee-dah
Past
같이했어
gah-chee-hae-ssuh
같이했어요
gah-chee-hae-ssuh-yoh
같이했습니다
gah-chee-hae-sseum-nee-dah
Future
같이할 거야
gah-chee-hahl- -guh-yah
같이할 거예요
gah-chee-hahl- -guh-yae-yoh
같이할 겁니다
gah-chee-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
같이하세요
gah-chee-hah-sae-yoh
Suggestion / Let's Polite (요)
같이해요
gah-chee-hae-yoh
Question Polite (요)
같이해요?
gah-chee-hae-yoh-?
Connective “and” — (고)
같이하고
gah-chee-hah-goh
Conditional “if” — (면)
같이하면
gah-chee-hah-myuhn
Noun form — (기)
같이함
gah-chee-hahm