jeoneun hagwoneseo bae-un pyohyeoneul bokseuphaeyo.

저 means I in a humble/polite way, and 는 is the topic particle.

So 저는 means something like as for me or simply I in natural English.

In Korean, particles show the role of a word in the sentence. Here, 는 marks 저 as the topic:

• 저는 = as for me / I

You could technically omit 저는 if the subject is already clear from context, but including it makes the sentence explicit and natural in many situations.

학원 means academy, cram school, or private institute.

에서 is used here to mark the place where an action happened. In this sentence, it connects to 배운:

• 학원에서 배운 = learned at the academy

So 에서 is not just saying location in a static sense; it marks the place where the learning took place.

Compare:

• 학원에 가요 = I go to the academy (에 for destination)
• 학원에서 공부해요 = I study at the academy (에서 for location of action)

배운 is the modifier form of the verb 배우다 (to learn). It is used to describe the noun that follows it.

Here:

• 배운 표현 = expressions that I learned / learned expressions

This is similar to how English uses a relative clause:

• the expressions that I learned at the academy

Korean often puts this descriptive verb form directly before the noun.

Compare:

• 배워요 = learn / am learning
• 배웠어요 = learned
• 배운 표현 = expressions learned

So 배운 is not a full standalone verb here; it is modifying 표현.

Because it is based on the past/adnominal form of the verb.

For action verbs, Korean often uses a past modifier to mean something that was done before the noun:

• 배운 표현 = expressions that were learned
• 읽은 책 = a book that I read
• 만든 음식 = food that I made

So yes, 배운 carries a past sense: the learning happened before the reviewing.

표현 means expression, phrase, or way of saying something.

을 is the object particle, marking 표현 as the thing being reviewed.

So:

• 표현을 복습해요 = I review the expressions

Because 표현 ends in a consonant, it takes 을. If a noun ends in a vowel, it takes 를 instead.

Examples:

• 책을 읽어요 = I read a book
• 영화를 봐요 = I watch a movie

복습하다 means to review something you already studied.

So 복습해요 means:

• I review
• I’m reviewing

It is commonly used in school/study contexts, especially for reviewing lessons, vocabulary, grammar, or expressions you learned earlier.

A useful contrast:

• 예습하다 = to preview/study in advance
• 복습하다 = to review afterward

Korean is generally a subject–object–verb language, so the verb usually comes at the end.

This sentence breaks down like this:

• 저는 = I / as for me
• 학원에서 배운 표현을 = the expressions learned at the academy
• 복습해요 = review

So the literal order is closer to:

• I the expressions learned at the academy review

That sounds unnatural in English, but it is normal in Korean.

Yes. It functions as one noun phrase.

You can think of it like this:

• 학원에서 = at the academy
• 배운 = learned
• 표현을 = expressions + object marker

Together:

• 학원에서 배운 표현을 = the expressions learned at the academy

This whole chunk is the object of 복습해요.

Yes, very often.

Korean frequently leaves out the subject when it is obvious from context. So in conversation, you might simply say:

• 학원에서 배운 표현을 복습해요.

This still naturally means I review the expressions I learned at the academy, if the speaker is clearly talking about themselves.

Including 저는 can add clarity, contrast, or emphasis:

• 저는 복습해요. = As for me, I review them.

-해요 is the polite informal style, also called the 해요-style. It is very common in everyday Korean and is polite without being overly formal.

Here:

• 복습하다 → 복습해요

This is appropriate in many normal situations, such as speaking to teachers, classmates, coworkers, or people you do not know very well.

Other possible styles:

• 복습합니다 = more formal
• 복습해 = casual/plain-to-close-friends

It is a good translation, especially in a language-learning context.

표현 can refer to:

• expressions
• phrases
• ways of saying things

So depending on context, this sentence could be understood as:

• I review the expressions I learned at the academy.
• I review the phrases I learned at the academy.

If this is about studying Korean, expressions is very natural.

Not most naturally.

Because 학원에서 is attached to 배운, the default reading is:

• expressions learned at the academy

So the sentence means:

• I review the expressions that I learned at the academy.

If you wanted to clearly say I review expressions at the academy, you would more naturally say:

• 저는 학원에서 표현을 복습해요.

That changes the structure so 학원에서 describes where the reviewing happens, not where the learning happened.