Verbseoul.
하다 verb

통화하다 conjugation (tonghwahada, to talk on the telephone)

To say to talk on the telephone politely in the present tense, use 통화해요 (tohng-hwah-hae-yoh) · tonghwahaeyo. Below is the full conjugation of 통화하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
통화해
tohng-hwah-hae
tonghwahae
통화해요
tohng-hwah-hae-yoh
tonghwahaeyo
통화합니다
tohng-hwah-hahm-nee-dah
tonghwahamnida
Past
통화했어
tohng-hwah-hae-ssuh
tonghwahaesseo
통화했어요
tohng-hwah-hae-ssuh-yoh
tonghwahaesseoyo
통화했습니다
tohng-hwah-hae-sseum-nee-dah
tonghwahaesseumnida
Future
통화할 거야
tohng-hwah-hahl guh-yah
tonghwahal geoya
통화할 거예요
tohng-hwah-hahl guh-yae-yoh
tonghwahal geoyeyo
통화할 겁니다
tohng-hwah-hahl guhm-nee-dah
tonghwahal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
통화하세요
tohng-hwah-hah-sae-yoh
tonghwahaseyo
Suggestion / Let's Polite (요)
통화해요
tohng-hwah-hae-yoh
tonghwahaeyo
Question Polite (요)
통화해요?
tohng-hwah-hae-yoh-?
tonghwahaeyo?
Connective "and" — (고)
통화하고
tohng-hwah-hah-goh
tonghwahago
Conditional "if" — (면)
통화하면
tohng-hwah-hah-myuhn
tonghwahamyeon
Progressive (고 있어요)
통화하고 있어요
tohng-hwah-hah-goh ee-ssuh-yoh
tonghwahago isseoyo
Want to (고 싶어요)
통화하고 싶어요
tohng-hwah-hah-goh shee-puh-yoh
tonghwahago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
통화할 수 있어요
tohng-hwah-hahl soo ee-ssuh-yoh
tonghwahal su isseoyo
Because / So (아/어서)
통화해서
tohng-hwah-hae-suh
tonghwahaeseo
Noun form — (기)
통화하기
tohng-hwah-hah-gee
tonghwahagi
Noun form — (음)
통화함
tohng-hwah-hahm
tonghwaham