siheomeul junbiharyeomyeon chaegi piryohaeyo.

You need a book to prepare for the exam.

Breakdown of siheomeul junbiharyeomyeon chaegi piryohaeyo.

• ~이: subject particle
• ~을: object particle
• 책: book
• 시험: exam
• 준비하다: to prepare
• 필요하다: necessary
• ~으려면: if one wants to (in order to)

Questions & Answers about siheomeul junbiharyeomyeon chaegi piryohaeyo.

What is the grammar function of -으려면 in 준비하려면?

-으려면 attaches to the verb stem to form a conditional meaning “if (you) want to …” or “in order to …”.

• 준비하려면 = 준비하다 (to prepare) + -으려면 → “if (you) intend to prepare”
• It’s a contraction of -려고 하면, so you might also see 준비하려고 하면 with the same meaning.

Why does 시험 take the object marker -을 here?

In 시험을 준비하려면, 시험 is the direct object of 준비하다 (to prepare).

• Korean verb phrases generally mark their object with -을/를.
• So 시험을 준비하다 literally means “to prepare (for) the exam.”

Why is 책 marked with -이 instead of -을 in 책이 필요해요?

In Korean, 필요하다 (“to need”) is a descriptive verb (adjective) that takes its required item as the subject:

• Noun + 이/가
  • 필요하다 → “(The) noun is needed.”
• Thus 책이 필요해요 literally means “A book is needed.”
• If you used 책을 필요하다, it would be ungrammatical because 필요하다 does not take an object.

How do you generally express “need” in Korean?

Use the pattern: Noun + 이/가 + 필요하다

• 필요하다 is treated like an adjective:
  • Present polite: 필요해요
  • Present formal: 필요합니다
  • Past: 필요했어요 (“was needed”)
• To say “don’t need,” attach 없다: Noun + 이/가 + 필요없다 → 필요없어요.

What is the nuance difference between -으려면 and -기 위해(서)?

Both can express purpose, but:

• -으려면 = “if you want to …” (conditional/intention)
• -기 위해(서) = “for the sake of …/in order to …” (neutral statement of purpose)
  Example:
  • 시험을 준비하려면 책이 필요해요. (“If you want to prepare for the exam, you need a book.”)
  • 시험을 준비하기 위해서 책을 사야 해요. (“In order to prepare for the exam, I have to buy a book.”)

Can you reverse the order of the clauses, putting 책이 필요해요 first?

Yes, but you’d generally connect them differently or add emphasis:

• Neutral → 시험을 준비하려면 책이 필요해요.
• Emphatic inversion → 책이 필요해요, 시험을 준비하려면. (colloquial, for effect)
  In standard style, subordinate (conditional) clauses usually come before the main clause.

What register is 필요해요? Can it change?

필요해요 is polite (해요-style). You can adjust register:

• Informal: 필요해
• Formal/deferential: 필요합니다
• Casual rough: 필요하다 (dictionary form, seldom used alone in speech)

Are there alternative ways to say the same idea?

Yes. Examples:

• 시험을 준비하려면 책 한 권이 있어야 돼요. (“If you want to prepare for the exam, you have to have a book.”)
• 시험 준비를 위해서는 책이 필요해요. (uses -을 위해서)
• 시험을 보려면 책이 꼭 필요해요. (uses 보다 for taking an exam)

Why not say 시험을 준비하려면 책이 필요하다 without -요?

You can if you’re writing a formal notice or in a textbook:

• 책이 필요하다 is dictionary form (neutral/written).
• Spoken polite style typically adds -요 → 필요해요.
  Choose formality based on context and audience.