Log inSign up

naeireun kkok hakgyoe gaya haeyo.

내일은 꼭 학교에 가야 해요.naeireun kkok hakgyoe gaya haeyo.
Be sure to go to school tomorrow.
FromLesson 13inHardcore Korean
……

Questions & Answers about naeireun kkok hakgyoe gaya haeyo.

In 내일은, why is the topic marker -은 used instead of the subject marker -이?
The particle -은 marks 내일 (“tomorrow”) as the topic, signaling “as for tomorrow…”. If you used 내일이, you’d simply be stating “tomorrow” as the grammatical subject. Using -은/는 often adds a contrastive or topical nuance, like “speaking of tomorrow…”.
What does 꼭 add to the sentence?
꼭 means “definitely,” “without fail,” or “for sure.” It emphasizes that going to school is non‐negotiable: 내일은 꼭 학교에 가야 해요 = “Tomorrow I absolutely must go to school.”
Why is the particle 에 used in 학교에 가야 해요?
The particle 에 marks the destination or direction of movement. When you go somewhere, you attach 에 to the place name. Thus 학교에 means “to school.”
How does 가야 해요 express obligation?

가야 해요 comes from the structure -아/어야 하다, which expresses necessity or obligation. Here’s the breakdown:
1) 가다 (“to go”) → stem 가-
2) Add -아야 → 가야 (“must go”)
3) Attach 하다 and make it polite → 가야 해요 (“have to go”)

Can you break down the formation of 가야 해요 step by step?
  1. Start with 가다 (to go).
  2. Drop -다, leaving 가-.
  3. Add -아야 (from -아/어야 하다): 가
    • 야 = 가야 (“must go”).
  4. Add 하다 as the main verb: 가야 하다.
  5. Conjugate 하다 politely: 가야 해요.
Is there a difference between 가야 해요 and 가야 돼요?

No significant difference in meaning—they both mean “must go.”

  • 가야 해요 comes from -아야 하다.
  • 가야 돼요 comes from -아야 되다.
    Both are common; -돼요 can sound a bit more colloquial, but they’re interchangeable.
Could you use 내일은 꼭 학교에 가야 돼요 instead, and would it be correct?
Yes. 내일은 꼭 학교에 가야 돼요 is perfectly correct. It simply uses -아야 되다 for obligation. The overall meaning is still “I absolutely must go to school tomorrow.”
How would you say this sentence in a more casual (informal) style?

You can drop the polite endings:

  • 내일은 꼭 학교에 가야 해.
  • 내일은 꼭 학교에 가야 돼.
    Even shorter:
  • 내일 꼭 학교 가야 돼.

More from this lesson

ibeonbakmulgwangagiro hadada-eum jumare chinguwa bakmulgwane gagiro haesseoyo.ibeon jumare chinguwa bakmulgwane gagiro haesseoyo.moimibeon moime chamseokhaeyo.da-eum moimeneun seonsaengnimdo chamseokhaeyo.
AI Language TutorTry it ↗
“How do speech levels work in Korean?”
Korean has multiple speech levels that indicate formality and politeness. The most common are the formal polite (‑습니다/‑ㅂ니다), informal polite (‑아요/‑어요), and casual (‑아/‑어) forms. Which level you use depends on who you're speaking to and the social context.

Sign up free — start using our AI language tutor

Start learning Korean

Master Korean — from naeireun kkok hakgyoe gaya haeyo to fluency

All course content and exercises are completely free — no paywalls, no trial periods.

  • ✓ Infinitely deep — unlimited vocabulary and grammar
  • ✓ Fast-paced — build complex sentences from the start
  • ✓ Unforgettable — efficient spaced repetition system
  • ✓ AI tutor to answer your grammar questions
Start learning Korean freeBrowse the full course