계획하다([gye-hoek-ha-da/plan]) means to plan. In polite speech, say 계획해요([gye-hoek-hae-yo]) or 계획합니다([gye-hoek-ham-ni-da]). Very common at work for schedule and project planning.
계획했어요([gye-hoek-hae-sseo-yo/planned]) is the polite past form. Example: 어제 계획을 세웠어요? Actually 계획했어요 (I planned it yesterday) is natural.
계획해야 해요([gye-hoek-hae-ya hae-yo/have to plan]) expresses obligation. Example: 내일까지 계획을 세워야 해요 → 계획해야 해요 (Have to plan by tomorrow) - essential EPS-TOPIK expression.
계획하다([gye-hoek-ha-da/plan]) means "to plan". To make a schedule, to arrange a project or trip in advance.
1. Schedule: “달력 보고 계획해요 (dal-lyeok bo-go gye-hoek-hae-yo)” Plan by looking at calendar
2. Past: 계획했어요([gye-hoek-hae-sseo-yo/planned]) - 어제 계획했어요, 여행을 계획했어요
3. Wish: 계획하고 싶어요([gye-hoek-ha-go si-peo-yo/want to plan]) - 여행을 계획하고 싶어요.
4. Must: 내일까지 계획해야 해요([gye-hoek-hae-ya hae-yo/have to plan]) - EPS-TOPIK work schedule expression.
A: How do you plan?
B: 달력 보고 계획해요. B: dal-lyeok bo-go gye-hoek-hae-yo.B: I plan by looking at the calendar. - 계획하다([gye-hoek-ha-da/plan])
A: Did you plan yesterday?
B: 네, 어제 계획했어요. B: ne, eo-je gye-hoek-hae-sseo-yo.B: Yes, I planned yesterday.
A: 뭘 계획했어요? A: mwol gye-hoek-hae-sseo-yo?A: What did you plan?
B: 여행을 계획했어요. B: yeo-haeng-eul gye-hoek-hae-sseo-yo.B: I planned a trip. - 계획했어요([gye-hoek-hae-sseo-yo/planned])
A: By when do you have to plan?
B: 내일까지 계획해야 해요. B: nae-il-kka-ji gye-hoek-hae-ya hae-yo.B: I have to plan by tomorrow.
A: 뭘 계획해야 해요? A: mwol gye-hoek-hae-ya hae-yo?A: What do you have to plan?
B: 작업 일정을 계획해야 해요. B: ja-geop il-jeong-eul gye-hoek-hae-ya hae-yo.B: I have to plan the work schedule. - 계획해야 해요([gye-hoek-hae-ya hae-yo/have to plan])
• 계획하다([gye-hoek-ha-da/plan]) plan
- 계획했어요([gye-hoek-hae-sseo-yo/planned]) planned
- 계획하고 싶어요([gye-hoek-ha-go si-peo-yo/want to plan]) want to plan
- 계획해야 해요([gye-hoek-hae-ya hae-yo/have to plan]) have to plan
- 계획하지 마세요([gye-hoek-ha-ji ma-se-yo/don't plan]) don't plan