시작되다([si-jak-doe-da/begin]) means something begins by itself. In polite speech, say 시작돼요([si-jak-dwae-yo]).
시작됐어요([si-jak-dwae-sseo-yo/began]) is the polite past form. Example: 회의가 시작됐어요 (The meeting began).
시작돼야 해요([si-jak-dwae-ya hae-yo/have to begin]) means it has to begin. Example: 9시에 시작돼야 해요 (It has to begin at 9).
시작되다([si-jak-doe-da/begin]) means "to begin". It is used when something starts by itself.
1. Daily: “영화가 시작돼요 (yeong-hwa-ga si-jak-dwae-yo)”
2. Past: 시작됐어요([si-jak-dwae-sseo-yo/began]) began.
3. Duty: 시작돼야 해요([si-jak-dwae-ya hae-yo/have to begin]) have to begin.
4. Warning: 시작되지 마세요([si-jak-doe-ji ma-se-yo/don't begin]) don't begin.
A: When does it begin?
B: 9시에 시작돼요. B: a-hop-si-e si-jak-dwae-yo.B: It begins at 9 o'clock.
A: 뭐가 시작돼요? A: mwo-ga si-jak-dwae-yo?A: What begins?
B: 영화가 시작돼요. B: yeong-hwa-ga si-jak-dwae-yo.B: The movie begins. - 시작되다([si-jak-doe-da/begin])
A: Did it begin yesterday?
B: 네, 시작됐어요. B: ne, si-jak-dwae-sseo-yo.B: Yes, it began.
A: 언제 시작됐어요? A: eon-je si-jak-dwae-sseo-yo?A: When did it begin?
B: 9시에 시작됐어요. B: a-hop-si-e si-jak-dwae-sseo-yo.B: It began at 9 o'clock. - 시작됐어요([si-jak-dwae-sseo-yo/began])
A: When does it have to begin?
B: 10시에 시작돼야 해요. B: yeol-si-e si-jak-dwae-ya hae-yo.B: It has to begin at 10 o'clock.
A: 왜 시작돼야 해요? A: wae si-jak-dwae-ya hae-yo?A: Why does it have to begin?
B: 손님이 와서 시작돼야 해요. B: son-ni-mi wa-seo si-jak-dwae-ya hae-yo.B: It has to begin because guests are here. - 시작돼야 해요([si-jak-dwae-ya hae-yo/have to begin])
• 시작되다([si-jak-doe-da/begin]) begin
- 시작됐어요([si-jak-dwae-sseo-yo/began]) began
- 시작되고 싶어요([si-jak-doe-go si-peo-yo/want to begin]) want to begin
- 시작돼야 해요([si-jak-dwae-ya hae-yo/have to begin]) have to begin
- 시작되지 마세요([si-jak-doe-ji ma-se-yo/don't begin]) don't begin