Verbseoul.
하다 verb (adj)
필요하다pilyohadato have a need

To say to have a need politely in the present tense, use 필요해요 (pee-ryoh-hae-yoh). Below is the full conjugation of 필요하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
필요해
pee-ryoh-hae
필요해요
pee-ryoh-hae-yoh
필요합니다
pee-ryoh-hahm-nee-dah
Past
필요했어
pee-ryoh-hae-ssuh
필요했어요
pee-ryoh-hae-ssuh-yoh
필요했습니다
pee-ryoh-hae-sseum-nee-dah
Future
필요할 거야
pee-ryoh-hahl- -guh-yah
필요할 거예요
pee-ryoh-hahl- -guh-yae-yoh
필요할 겁니다
pee-ryoh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
필요하세요
pee-ryoh-hah-sae-yoh
Suggestion / Let's Polite (요)
필요해요
pee-ryoh-hae-yoh
Question Polite (요)
필요해요?
pee-ryoh-hae-yoh-?
Connective “and” — (고)
필요하고
pee-ryoh-hah-goh
Conditional “if” — (면)
필요하면
pee-ryoh-hah-myuhn
Noun form — (기)
필요함
pee-ryoh-hahm