Verbseoul.
ㄹ stem
떨다tteoldato shake, to shiver, to tremble, to shudder

To say to shake, to shiver, to tremble, to shudder politely in the present tense, use 떨어요 (ttuh-ruh-yoh). Below is the full conjugation of 떨다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
떨어
ttuh-ruh
떨어요
ttuh-ruh-yoh
떱니다
ttuhm-nee-dah
Past
떨었어
ttuh-ruh-ssuh
떨었어요
ttuh-ruh-ssuh-yoh
떨었습니다
ttuh-ruh-sseum-nee-dah
Future
떨 거야
ttuhl- -guh-yah
떨 거예요
ttuhl- -guh-yae-yoh
떨 겁니다
ttuhl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
떠세요
ttuh-sae-yoh
Suggestion / Let's Polite (요)
떨어요
ttuh-ruh-yoh
Question Polite (요)
떨어요?
ttuh-ruh-yoh-?
Connective “and” — (고)
떨고
ttuhl-goh
Conditional “if” — (면)
떨면
ttuhl-myuhn
Noun form — (기)
ttuhm