Verbseoul.
하다 verb
데모하다demohadato demonstrate (to show how to use something)

To say to demonstrate (to show how to use something) politely in the present tense, use 데모해요 (dae-moh-hae-yoh). Below is the full conjugation of 데모하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
데모해
dae-moh-hae
데모해요
dae-moh-hae-yoh
데모합니다
dae-moh-hahm-nee-dah
Past
데모했어
dae-moh-hae-ssuh
데모했어요
dae-moh-hae-ssuh-yoh
데모했습니다
dae-moh-hae-sseum-nee-dah
Future
데모할 거야
dae-moh-hahl- -guh-yah
데모할 거예요
dae-moh-hahl- -guh-yae-yoh
데모할 겁니다
dae-moh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
데모하세요
dae-moh-hah-sae-yoh
Suggestion / Let's Polite (요)
데모해요
dae-moh-hae-yoh
Question Polite (요)
데모해요?
dae-moh-hae-yoh-?
Connective “and” — (고)
데모하고
dae-moh-hah-goh
Conditional “if” — (면)
데모하면
dae-moh-hah-myuhn
Noun form — (기)
데모함
dae-moh-hahm