사용되다([sa-yong-doe-da/be used]) means something is utilized. In polite speech, say 사용돼요([sa-yong-dwae-yo]).
사용됐어요([sa-yong-dwae-sseo-yo/was used]) is the polite past form. Example: 사용됐어요 (It was used).
사용돼야 해요([sa-yong-dwae-ya hae-yo/have to be used]) means it must be used. Example: 사용돼야 해요 (It has to be used).
사용되다([sa-yong-doe-da/be used]) means "to be used". It is passive of 사용하다 (to use).
1. Daily: “이 카드가 사용돼요? (i ka-deu-ga sa-yong-dwae-yo)” Is this card used?
2. Past: 사용됐어요([sa-yong-dwae-sseo-yo/was used]) was used.
3. Duty: 사용돼야 해요([sa-yong-dwae-ya hae-yo/have to be used]) has to be used.
4. Warning: 사용되지 마세요([sa-yong-doe-ji ma-se-yo/don't be used]) don't be used.
A: Is this card used?
B: 네, 사용돼요. B: ne, sa-yong-dwae-yo.B: Yes, it is used.
A: 어디서 사용돼요? A: eo-di-seo sa-yong-dwae-yo?A: Where is it used?
B: 마트에서 사용돼요. B: ma-teu-e-seo sa-yong-dwae-yo.B: It is used at the mart. - 사용되다([sa-yong-doe-da/be used])
A: When was it used?
B: 어제 사용됐어요. B: eo-je sa-yong-dwae-sseo-yo.B: It was used yesterday.
A: 어디서 사용됐어요? A: eo-di-seo sa-yong-dwae-sseo-yo?A: Where was it used?
B: 회사에서 사용됐어요. B: hoe-sa-e-seo sa-yong-dwae-sseo-yo.B: It was used at the company. - 사용됐어요([sa-yong-dwae-sseo-yo/was used])
A: When does it have to be used?
B: 오늘 사용돼야 해요. B: o-neul sa-yong-dwae-ya hae-yo.B: It has to be used today.
A: 어디서 사용돼야 해요? A: eo-di-seo sa-yong-dwae-ya hae-yo?A: Where does it have to be used?
B: 공장에서 사용돼야 해요. B: gong-jang-e-seo sa-yong-dwae-ya hae-yo.B: It has to be used at the factory. - 사용돼야 해요([sa-yong-dwae-ya hae-yo/have to be used])
• 사용되다([sa-yong-doe-da/be used]) be used
- 사용됐어요([sa-yong-dwae-sseo-yo/was used]) was used
- 사용되고 싶어요([sa-yong-doe-go si-peo-yo/want to be used]) want to be used
- 사용돼야 해요([sa-yong-dwae-ya hae-yo/have to be used]) have to be used
- 사용되지 마세요([sa-yong-doe-ji ma-se-yo/don't be used]) don't be used