naega sopumeul surihal tenikka neoneun daesareul yeonseuphae.

-ㄹ/을 테니까 means something like since I will..., because I’m going to..., or so... with a sense of the speaker’s intention or expectation.

So 수리할 테니까 means:

• since I’m going to repair it
• because I’ll fix the props
• I’ll take care of repairing the props, so...

In this sentence, it sets up a reason for the second clause:

• 내가 소품을 수리할 테니까 = I’ll repair the props, so...
• 너는 대사를 연습해 = you practice the lines.

This pattern is very often used when the speaker gives a suggestion, instruction, or request based on what they themselves will do.

Good question. The difference is about time and nuance.

• 수리하니까 = because I repair / because I am repairing / since I repair
• 수리할 테니까 = because I will repair / since I’m going to repair

Here, the speaker is talking about a planned action they are about to do, so 수리할 테니까 fits better.

Also, -ㄹ 테니까 often carries a nuance of:

• the speaker’s decision
• the speaker’s intention
• a reason that supports a following request, command, or suggestion

So this sentence sounds natural because it divides responsibilities:

• I’ll fix the props
• so you practice the lines

내가 uses the subject marker -가, while 나는 uses the topic marker -는.

In this sentence, 내가 puts focus on who will do the repairing:

• 내가 소품을 수리할 테니까 = I’ll be the one to repair the props

This works especially well because the sentence contrasts two people’s roles:

• I will repair the props
• you practice the lines

If you said 나는, it would sound more like introducing me as the topic, but 내가 is more natural when highlighting the division of tasks.

So the sentence has a nice contrast:

• 내가 ... = I will do this
• 너는 ... = you, on the other hand, do that

너는 uses the topic/contrast marker -는, and that contrast is important here.

It gives the sense of:

• As for you, practice the lines
• You, meanwhile, practice the lines

The sentence is basically assigning roles:

• I’ll handle the props
• you handle the lines

If you used 네가, the focus would be more strongly on you as the subject, but 너는 sounds more natural for contrast in this kind of “I do X, you do Y” structure.

So 너는 helps create the feeling of: I’ll do my part, and you do yours.

소품 usually means props, especially in theater, film, or performance contexts.

So here it refers to the physical items used in a performance, not major set pieces.

Examples:

• stage props
• hand props
• small performance items

Because the other noun is 대사 (lines/dialogue), the whole sentence clearly sounds like something said in a rehearsal or performance setting.

Yes, 대사 usually means lines or dialogue in a script, play, movie, or performance.

Depending on context, it can mean:

• a character’s spoken lines
• dialogue in a script
• what an actor needs to memorize and practice

In this sentence, 대사를 연습해 most naturally means:

• practice your lines
• rehearse the dialogue

Even though your is not explicitly stated in Korean, it is understood from context.

The particle -를 marks the object of the verb.

So:

• 대사 = lines / dialogue
• 대사를 = the lines (as the thing being practiced)

And:

• 연습하다 = to practice

So 대사를 연습해 literally means: Practice the lines.

This is very straightforward Korean object marking:

• 소품을 수리하다 = repair the props
• 대사를 연습하다 = practice the lines

연습해 is the informal casual form.

It is used when speaking to:

• a close friend
• someone younger
• a peer in a casual setting

So the sentence sounds like casual speech between people who are close enough to use 반말.

Comparison:

• 연습해 = casual, informal: Practice the lines.
• 연습해요 = polite: Please practice the lines.
• 연습해라 = stronger/blunter command, often masculine or authoritative in tone

So 연습해 sounds like a normal casual instruction, not overly harsh.

A polite version of the whole sentence could be:

• 제가 소품을 수리할 테니까, 당신은 대사를 연습하세요. But in real Korean, pronouns would often be dropped.

Yes. Very commonly.

One of the most common uses of -ㄹ/을 테니까 is:

• the speaker states what they will do or what they expect
• then follows with a request, command, suggestion, or instruction

For example:

• 내가 먼저 갈 테니까 너는 뒤따라 와.
  I’ll go first, so you follow behind.
• 제가 설명할 테니까 잘 들으세요.
  I’ll explain, so please listen carefully.

So this sentence follows a very natural pattern:

• I’ll take care of this
• so you do that

Yes, very often.

Korean frequently drops pronouns when they are clear from context. So in a real conversation, you might hear:

• 소품을 수리할 테니까 대사를 연습해.

This would still be understood as: I’ll repair the props, so you practice the lines.

However, the version with 내가 and 너는 sounds more explicit and more contrastive. It emphasizes the division of labor:

• I will repair the props
• you practice the lines

So the pronouns are not required, but they are useful when the speaker wants to clearly assign roles.

The overall nuance is: Let’s split the work: I’ll handle one part, and you handle the other.

It sounds like:

• a practical instruction
• something said during rehearsal or preparation
• a casual but purposeful assignment of tasks

It is not just stating two actions. The grammar shows a connection:

• I’m going to repair the props
• therefore / so in the meantime, you practice the lines

So the sentence feels cooperative and task-oriented, not random.

Potentially, yes, depending on who is speaking to whom.

너 is only appropriate:

• with close friends
• to someone younger
• in certain intimate or equal-status relationships

If used to the wrong person, it can sound rude or too direct.

So this sentence is natural only in a casual relationship where 반말 is appropriate.

If speaking politely, Korean would usually avoid 너 and often omit the subject entirely. For example:

• 제가 소품을 수리할 테니까 대사를 연습하세요.

Or even more naturally:

• 소품은 제가 수리할 테니까 대사 연습하세요.

So yes, 너 is fine in the right relationship, but not universally safe.

Yes, it can.

수리하다 means to repair, to fix, or to mend, especially when something is damaged or needs fixing.

So 소품을 수리하다 means:

• repair the props
• fix the props

Depending on the exact prop, other verbs could also work in some situations, such as:

• 고치다 = fix
• 정리하다 = organize/tidy up
• 만들다 = make

But if the props are broken or need repair, 수리하다 is completely natural.