amachueo geukdani mudae uisangeul junbihaesseo.

아마추어 극단 means an amateur theater troupe/company.

• 아마추어 = amateur
• 극단 = a theater troupe, dramatic company, or stage group

In Korean, nouns are often placed next to each other like this to make one larger noun phrase, so 아마추어 극단 is literally something like amateur theater group.

The particle 이/가 marks the subject.

Here, the subject is 아마추어 극단이 = the amateur theater troupe.

Korean chooses between 이 and 가 based on the final sound of the noun:

• after a noun ending in a consonant → 이
• after a noun ending in a vowel → 가

극단 ends in ㄴ, which is a consonant, so it becomes 극단이.

It is two nouns working together as one idea:

• 무대 = stage
• 의상 = clothing, costume

So 무대 의상 means stage costume(s) or costumes for the stage.

This kind of noun-noun combination is very common in Korean. English often uses the same pattern too, like stage costume, school uniform, or winter clothes.

을/를 marks the direct object, meaning the thing that receives the action.

Here, the thing being prepared is 무대 의상, so it takes the object particle:

• 무대 의상을 = stage costume(s) as the object

Again, the form depends on the final sound:

• consonant ending → 을
• vowel ending → 를

의상 ends in ㅇ, which counts as a consonant sound, so it becomes 의상을.

준비했어 comes from the verb 준비하다, which means to prepare.

Breakdown:

• 준비하- = verb stem
• -았/었- = past tense
• -어 = casual sentence ending

So 준비했어 means prepared or got ready in a casual style.

Because 하다 verbs often contract in the past tense:

• 준비하였어 → 준비했어

This contraction is completely normal.

The ending shows the speech level.

• 준비했어 = casual / intimate
• 준비했어요 = polite
• 준비했습니다 = formal

So this sentence is in a plain casual style, the kind you would use with:

• close friends
• younger people
• someone you are on casual terms with
• diary-style narration
• some subtitles or informal storytelling

The meaning stays the same; only the level of politeness changes.

Korean often does not mark singular vs. plural unless it really needs to.

So 의상 can mean:

• costume
• costumes
• clothing
• outfits

Context tells you which one sounds most natural in English. Since a theater troupe usually prepares more than one costume, English often translates it as costumes.

If Korean really wanted to emphasize plurality, it could sometimes use 의상들, but that is often unnecessary.

Yes. 이/가 and 은/는 are not interchangeable in every situation.

• 이/가 marks the grammatical subject more directly
• 은/는 marks the topic and often adds contrast or backgrounding nuance

So:

• 아마추어 극단이 무대 의상을 준비했어.
  = The amateur troupe prepared the stage costumes.
  This sounds like straightforward information about who did it.

• 아마추어 극단은 무대 의상을 준비했어.
  = As for the amateur troupe, it prepared the stage costumes.
  This can sound more topical or contrastive, depending on context.

A learner will often first translate both as the same thing, but the nuance is different.

The basic order is:

subject + object + verb

So:

• 아마추어 극단이 = subject
• 무대 의상을 = object
• 준비했어 = verb

This is the normal Korean pattern, often called SOV.

English is usually SVO:

• The amateur troupe
  • prepared
    • the stage costumes

So one adjustment for English speakers is getting used to the verb coming at the end in Korean.

Yes. 준비하다 is flexible.

Depending on context, 무대 의상을 준비했어 could mean:

• prepared the stage costumes
• got the costumes ready
• made arrangements for the stage costumes
• readied the costumes for performance

It does not always mean they personally made or sewed the costumes. It could simply mean they arranged, collected, organized, or set them out.

No. 아마추어 is a loanword from amateur.

Korean has many loanwords, especially in fields like sports, art, theater, music, and technology. Even though it comes from English, its pronunciation and usage follow Korean patterns.

So in this sentence:

• 아마추어 극단 is a perfectly natural Korean phrase
• it does not sound strange just because one part is a loanword

Yes. Korean does not have articles like a/an and the, so context decides that in English.

Depending on the situation, 아마추어 극단이 무대 의상을 준비했어 could be translated as:

• The amateur theater troupe prepared the stage costumes.
• An amateur theater troupe prepared the stage costumes.
• The amateur troupe got the stage costumes ready.

English requires an article, but Korean does not. That is why article choice comes from context, not from a specific word in the Korean sentence.