Verbseoul.
하다 verb
사용하다sayonghadato use

To say to use politely in the present tense, use 사용해요 (sah-yohng-hae-yoh). Below is the full conjugation of 사용하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
사용해
sah-yohng-hae
사용해요
sah-yohng-hae-yoh
사용합니다
sah-yohng-hahm-nee-dah
Past
사용했어
sah-yohng-hae-ssuh
사용했어요
sah-yohng-hae-ssuh-yoh
사용했습니다
sah-yohng-hae-sseum-nee-dah
Future
사용할 거야
sah-yohng-hahl- -guh-yah
사용할 거예요
sah-yohng-hahl- -guh-yae-yoh
사용할 겁니다
sah-yohng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
사용하세요
sah-yohng-hah-sae-yoh
Suggestion / Let's Polite (요)
사용해요
sah-yohng-hae-yoh
Question Polite (요)
사용해요?
sah-yohng-hae-yoh-?
Connective “and” — (고)
사용하고
sah-yohng-hah-goh
Conditional “if” — (면)
사용하면
sah-yohng-hah-myuhn
Noun form — (기)
사용함
sah-yohng-hahm