주문하다([ju-mun-ha-da/order]) means request food, ask for meal. In polite speech, say 주문해요([ju-mun-hae-yo]).
주문했어요([ju-mun-hae-sseo-yo/ordered]) is the polite past form. Example: 커피를 주문했어요 (I ordered coffee).
주문해야 해요([ju-mun-hae-ya hae-yo/have to order]) means must request. Example: 미리 주문해야 해요 (I have to order in advance).
주문하다([ju-mun-ha-da/order]) means "to order". It is used when you request food, ask for meal.
1. Daily: “뭐 주문해요? (mwo ju-mun-hae-yo)”
2. Past: 주문했어요([ju-mun-hae-sseo-yo/ordered]) ordered.
3. Duty: 주문해야 해요([ju-mun-hae-ya hae-yo/have to order]) have to order.
4. Warning: 주문하지 마세요([ju-mun-ha-ji ma-se-yo/don't order]) don't order.
A: What do you order?
B: 커피를 주문해요. B: keo-pi-reul ju-mun-hae-yo.B: I order coffee.
A: 커피를 주문해요? A: keo-pi-reul ju-mun-hae-yo?A: You order coffee?
B: 네, 커피를 주문해요. B: ne, keo-pi-reul ju-mun-hae-yo.B: Yes, coffee. - 주문하다([ju-mun-ha-da/order])
A: Did you order?
B: 네, 주문했어요. B: ne, ju-mun-hae-sseo-yo.B: Yes, I ordered.
A: 뭐 주문했어요? A: mwo ju-mun-hae-sseo-yo?A: What did you order?
B: 피자를 주문했어요. B: pi-ja-reul ju-mun-hae-sseo-yo.B: I ordered pizza. - 주문했어요([ju-mun-hae-sseo-yo/ordered])
A: When do you have to order?
B: 지금 주문해야 해요. B: ji-geum ju-mun-hae-ya hae-yo.B: I have to order now.
A: 지금 주문해야 해요? A: ji-geum ju-mun-hae-ya hae-yo?A: Now?
B: 네, 지금 주문해야 해요. B: ne, ji-geum ju-mun-hae-ya hae-yo.B: Yes, now. - 주문해야 해요([ju-mun-hae-ya hae-yo/have to order])
• 주문하다([ju-mun-ha-da/order]) order
- 주문했어요([ju-mun-hae-sseo-yo/ordered]) ordered
- 주문하고 싶어요([ju-mun-ha-go si-peo-yo/want to order]) want to order
- 주문해야 해요([ju-mun-hae-ya hae-yo/have to order]) have to order
- 주문하지 마세요([ju-mun-ha-ji ma-se-yo/don't order]) don't order