riheoseol naenae yeonseuphaesseo.

내내 means throughout, the whole time, or from beginning to end of a period.

So 리허설 내내 means throughout the rehearsal.

A useful pattern is:

• Noun + 내내 = throughout that time period

Examples:

• 하루 내내 = all day
• 여름 내내 = all summer
• 회의 내내 = throughout the meeting

So in this sentence, 리허설 내내 tells you the action lasted for the entire rehearsal.

Because 내내 itself follows the noun directly and forms a time expression.

So you normally say:

• 리허설 내내
• 하루 내내
• 방학 내내

not usually:

• 리허설을 내내
• 리허설에 내내

In other words, 리허설 내내 works as a fixed adverbial phrase meaning throughout the rehearsal.

This is a very natural question.

리허설 is the event: the rehearsal itself.
연습하다 is the action: to practice.

So the sentence is saying that someone practiced during the entire rehearsal.

It may sound a little repetitive in English at first, but in Korean it is completely natural. It is similar to saying:

• I practiced the whole rehearsal
• I kept practicing throughout rehearsal

The two words are not doing the same job:

• 리허설 = the time/event
• 연습했어 = what the person did during that time

연습했어 is the verb 연습하다 in the past tense casual/informal style.

Breakdown:

• 연습하다 = to practice
• 연습했- = practiced
• -어 = casual ending

So this is the kind of form you would use with:

• friends
• someone younger
• someone you are close to

More polite versions:

• 연습했어요 = polite
• 연습했습니다 = formal

Because the speaker is talking about a completed action.

연습했어 means the practicing happened and is now over. The sentence refers to what happened during the rehearsal as a finished event.

Even though the action lasted over a period of time, Korean still uses the past tense because the whole event is being looked at as completed.

The subject is omitted.

This is extremely common in Korean when the subject is clear from context. Depending on the situation, it could mean:

• I practiced throughout the rehearsal
• we practiced throughout the rehearsal
• he/she/they practiced throughout the rehearsal

Korean often leaves out subjects if they are already understood.

They are similar, but 내내 often emphasizes the entire span without interruption more strongly.

Compare:

• 리허설 동안 연습했어 = I practiced during the rehearsal.
• 리허설 내내 연습했어 = I practiced throughout the rehearsal / the whole rehearsal.

So 내내 gives a stronger feeling of all the way through.

Sometimes 동안 can sound more neutral, while 내내 highlights that it lasted continuously across the whole period.

Yes, but the nuance changes a little.

• 리허설 내내 연습했어 = I practiced throughout the rehearsal.
• 리허설 동안 계속 연습했어 = I kept practicing during the rehearsal.

계속 focuses on the idea of continuing or keeping on doing the action.
내내 focuses on the entire time period.

They are close in meaning, and sometimes they can even be used together:

• 리허설 내내 계속 연습했어

That sounds like I kept practicing the whole rehearsal.

No. 리허설 is a loanword from English rehearsal.

Korean uses many loanwords, especially for music, theater, dance, media, and performance contexts.

So:

• 리허설 = rehearsal

Even though it comes from English, it behaves like a normal Korean noun in the sentence.

Yes, but Korean word order is also somewhat flexible.

The most natural order here is:

• 리허설 내내 연습했어

This follows the common Korean pattern:

• time expression + verb

So first you set the time frame, then you say what happened.

You could move things around in some contexts for emphasis, but this version is the most straightforward and natural for everyday speech.

You can change only the ending:

• casual: 리허설 내내 연습했어
• polite: 리허설 내내 연습했어요
• formal: 리허설 내내 연습했습니다

The meaning stays the same. Only the speech level changes.