Verbseoul.
하다 verb
잘하다jalhadato do something well, to be good at

To say to do something well, to be good at politely in the present tense, use 잘해요 (chahl-hae-yoh). Below is the full conjugation of 잘하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
잘해
chahl-hae
잘해요
chahl-hae-yoh
잘합니다
chahl-hahm-nee-dah
Past
잘했어
chahl-hae-ssuh
잘했어요
chahl-hae-ssuh-yoh
잘했습니다
chahl-hae-sseum-nee-dah
Future
잘할 거야
chahl-hahl- -guh-yah
잘할 거예요
chahl-hahl- -guh-yae-yoh
잘할 겁니다
chahl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
잘하세요
chahl-hah-sae-yoh
Suggestion / Let's Polite (요)
잘해요
chahl-hae-yoh
Question Polite (요)
잘해요?
chahl-hae-yoh-?
Connective “and” — (고)
잘하고
chahl-hah-goh
Conditional “if” — (면)
잘하면
chahl-hah-myuhn
Noun form — (기)
잘함
chahl-hahm