✍️ Intermediate Day 11: Talking About Necessity – ~아/어야 돼요

📘 Intermediate Day 11: Talking About Necessity – ~아/어야 돼요

Welcome to Day 11 of the Intermediate Korean series! 🌟 Today we’re learning how to say “I have to…” or “You must…” using the essential grammar pattern:

  • ~아/어야 돼요 – to express obligation or necessity

This expression is very useful in daily life – whether it’s homework, appointments, rules, or advice. Let's learn how to use it correctly in various situations!

📘 What Does ~아/어야 돼요 Mean?

~아/어야 돼요 (or ~아/어야 해요) means “have to / must / should.” It’s used when something is necessary or required. You can use either 돼요 or 해요 interchangeably – 돼요 is slightly more common in conversation.


📘 How to Form It

Pattern:

  • Verb stem + 아야 돼요 (for verbs ending in ㅏ or ㅗ)
  • Verb stem + 어야 돼요 (for all other vowels)
  • 하다 → 해야 돼요

📌 Vocabulary Table – Common Action Verbs

English Korean Romanization
to study공부하다gong-bu-ha-da
to go가다ga-da
to rest쉬다swi-da
to meet만나다man-na-da
to wake up일어나다i-reo-na-da

📘 Example Sentences

  • 내일 시험이 있어요. 공부해야 돼요.
    nae-il si-heom-i it-seo-yo. gong-bu-hae-ya dwae-yo
    👉 I have a test tomorrow. I have to study.
  • 늦었어요. 지금 가야 돼요.
    neu-jeot-seo-yo. ji-geum ga-ya dwae-yo
    👉 I’m late. I have to go now.
  • 감기에 걸렸어요. 쉬어야 돼요.
    gam-gi-e geol-ryeot-seo-yo. swi-eo-ya dwae-yo
    👉 I caught a cold. I must rest.
  • 아침 7시에 일어나야 돼요.
    a-chim chil-si-e i-reo-na-ya dwae-yo
    👉 I have to wake up at 7am.

📘 Negative Form – Don’t Have to

To express “don’t have to,” use:

  • ~아/어도 돼요 → permission / it’s okay to...
  • ~지 않아도 돼요 → not necessary to do...
  • 지금 가도 돼요.
    ji-geum ga-do dwae-yo
    👉 You may go now.
  • 공부하지 않아도 돼요.
    gong-bu-ha-ji an-a-do dwae-yo
    👉 You don’t have to study.

💬 Real-Life Dialogue

👧 수지: 오늘 저녁에 영화 볼래요?
👦 준호: 미안해요. 과제를 해야 돼요.
👧 수지: 아, 그래요? 내일은 어때요?

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📘 Practice Sentences

  • 오늘은 집에 일찍 들어가야 돼요.
  • 지하철에서 조용히 해야 돼요.
  • 이 약은 식사 후에 먹어야 돼요.
  • 숙제를 안 해도 돼요.

🧪 Mini Quiz – Must or Not?

  1. Translate: “I have to call my mom.”
    Click to Show Answer

    엄마에게 전화해야 돼요.

  2. How do you say “You don’t have to come”?
    Click to Show Answer

    오지 않아도 돼요.

  3. Choose the correct form:
    a) 먹야 돼요
    b) 먹어야 돼요
    c) 먹하다 돼요
    Click to Show Answer

    ✅ b) 먹어야 돼요


✅ Conclusion

🎯 Well done! Now you know how to express necessity and obligation in Korean using ~아/어야 돼요.

  • ✔️ Use it when you have to do something
  • ✔️ Use ~지 않아도 돼요 when it’s not necessary
  • ✔️ Practice with real-life daily routine examples


📘 Coming Up Next

Tomorrow: Intermediate Day 12: Talking About Possibility – ~ㄹ 수 있다 / 없다 We’ll learn how to say what you can and can’t do in Korean!

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