Breakdown of sueop jeone gwajereul jechulhaeya haeyo.
~을~eul
object particle
수업sueop
class
전에jeone
before
해야 하다haeya hada
to have to
제출하다jechulhada
to submit
과제gwaje
assignment
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Questions & Answers about sueop jeone gwajereul jechulhaeya haeyo.
Why is 수업 전에 used to mean before class? What does 전에 do here?
전에 is a time particle that attaches to a noun to mean “before (noun).”
- 수업 (class) + 전에 = 수업 전에 (“before class”).
- It turns 수업 into an adverbial phrase indicating when something happens.
- You can likewise use 후에 (“after”) as in 수업 후에 = “after class.”
What does 과제 mean and why is it followed by 를 in 과제를 제출해야 해요?
과제 means “assignment” or “homework.”
- The particle 를 marks it as the direct object of the verb.
- In Korean, objects generally need 을/를 to show what’s being acted upon.
- So 과제를 tells us “the assignment” is what you must submit.
What does the structure ~아/어야 해요 express? How do I form it correctly?
The pattern ~아/어야 해요 expresses obligation (“must” or “have to”).
Formation steps:
- Take the verb stem (drop -다 from the dictionary form).
- If the last vowel of the stem is ㅏ or ㅗ, add -아야 해요; otherwise add -어야 해요.
- 제출하다 → stem 제출하- → 제출하 + 아야 해요 = 제출해야 해요.
- This literally means “it’s necessary to submit.”
Can I use ~아/어야 돼요 instead of ~아/어야 해요? Are they the same?
Yes. Both express “have to”:
- ~아/어야 해요 comes from 하다 (“to do”).
- ~아/어야 돼요 comes from 되다 (“to become”).
They’re largely interchangeable in speech. - 해야 해요 is slightly more neutral/polite.
- 해야 돼요 can feel a bit more casual.
Could I say 과제를 내야 해요 instead of 과제를 제출해야 해요? What’s the difference between 내다 and 제출하다?
Yes, you can say 과제를 내야 해요.
- 내다 means “to turn in” or “to hand in” and is common in everyday contexts.
- 제출하다 is more formal/offical (“to submit”).
In most classroom conversations, they’re used interchangeably.
Why is the verb 제출해야 해요 at the end of the sentence? Can I move it earlier?
Korean follows Subject-Object-Verb (SOV) order, so the verb always ends the clause.
You can shuffle time and object phrases before that—for example:
- 수업 전에 과제를 제출해야 해요.
- 과제를 수업 전에 제출해야 해요.
But the verb phrase 제출해야 해요 stays at the very end.
What level of politeness is -해야 해요? How would I make it more or less formal?
-해야 해요 is polite (해요체), suitable for everyday situations (e.g., teacher–student, coworkers).
- More formal (합니다체): 수업 전에 과제를 제출해야 합니다.
- Less formal/casual (해체): 수업 전에 과제를 제출해야 해.