imouto ha gooru no mae de tomatte simatte, ruuru wo mou itido sensei ni kiita.

は marks 妹 as the topic of the sentence: as for my younger sister...

That means the sentence is talking about what happened to her. Using が would put more focus on 妹 as the grammatical subject in a more neutral or contrastive way.

So:

• 妹は = as for my younger sister...
• 妹が = my younger sister (is the one who)...

In this sentence, は sounds very natural because the speaker is simply telling what she did next.

ゴールの前で means in front of the goal.

Breakdown:

• ゴール = goal
• の = links the two nouns
• 前 = front / before
• で = at / in / on, marking the place where an action happens

So literally, it is something like:

• at the front of the goal
• more naturally: in front of the goal

Because で marks the location where an action happens.

Here, the action is 止まってしまって (stopped), so で is used for the place where that happened.

Compare:

• 公園で遊ぶ = play in the park
• 駅で待つ = wait at the station

If you used に, it would suggest a destination or point of existence in many cases, which is not the main idea here.

So:

• ゴールの前で止まる = stop in front of the goal

That is why で is the natural choice.

止まって is the て-form of 止まる.

The て-form is being used to connect this action to the next one:

• she stopped,
• and then asked the teacher again about the rules.

So the sentence flow is:

• 止まってしまって、
• ルールをもう一度先生に聞いた。

The て-form often works like and, then, or after doing that.

しまう adds a nuance that something was done completely, or that it happened in a way the speaker sees as unfortunate, unexpected, or not ideal.

So 止まってしまって is not just stopped. It suggests something more like:

• ended up stopping
• stopped unintentionally
• stopped, and that was a problem / unfortunate

In this sentence, it likely suggests that the younger sister stopped in front of the goal and then had to ask the teacher about the rules again. That gives a feeling of confusion, hesitation, or an outcome that was not smooth.

It is a combination of:

• 止まって = te-form of 止まる
• しまって = te-form of しまう

So grammatically it is:

• 止まる + しまう

This is a very common pattern in Japanese:

• Vてしまう

Examples:

• 忘れてしまった = I forgot / I ended up forgetting
• 食べてしまった = I ate it all / I ended up eating it

So 止まってしまって means having ended up stopping... and then the sentence continues.

The て-form smoothly connects actions in sequence.

Here it shows:

1. she stopped in front of the goal,
2. then she asked the teacher about the rules again.

So 止まってしまって、ルールをもう一度先生に聞いた means roughly:

• She ended up stopping in front of the goal and then asked the teacher about the rules again.

This is a very natural Japanese way to connect events without repeating the subject or making two completely separate sentences.

With 聞く meaning to ask, Japanese often marks:

• the thing being asked with を
• the person being asked with に

So:

• ルールを聞く = ask about the rules
• 先生に聞く = ask the teacher

Combined:

• ルールを先生に聞く = ask the teacher about the rules

This pattern is very common.

Compare:

• 名前を彼に聞いた = I asked him his name
• 道をตำรวจに聞いた would be wrong because ตำรวจ is Thai, not Japanese
• correct example: 道を警官に聞いた = I asked the police officer for directions / about the way

もう一度 means once more or again.

In this sentence, it modifies 聞いた:

• もう一度先生に聞いた = asked the teacher one more time

Its placement is flexible, but putting it before the part it modifies is very natural.

You could also see similar word orders like:

• 先生にもう一度聞いた
• もう一度ルールを先生に聞いた

All of these are possible, though the original sentence sounds very natural.

Here it means asked.

The verb 聞く can mean several related things depending on context:

• hear
• listen
• ask

In this sentence, because there is:

• a person marked with に (先生に)
• and information marked with を (ルールを)

the meaning is clearly ask:

• asked the teacher about the rules

So context tells you which English meaning fits.

Because Japanese often omits information that is already clear from context.

The topic 妹は at the beginning applies to the whole sentence unless something changes. So after that, Japanese does not need to repeat 妹は again.

English would usually repeat the subject:

• My younger sister stopped in front of the goal and asked the teacher about the rules again.

Japanese often avoids that repetition.

Yes. The biggest extra nuance comes from 〜てしまう.

Without it, the sentence would be more neutral:

• 妹はゴールの前で止まって、ルールをもう一度先生に聞いた。

With 止まってしまって, it suggests something like:

• she ended up stopping
• maybe she was unsure or hesitant
• maybe stopping caused a problem or showed confusion

So the sentence does not just report two actions. It also gives a small emotional or situational hint: her stopping was not simply planned and smooth.

In theory, 前 can mean either front or before, depending on context. But here the meaning is clearly spatial, not time-related.

So:

• ゴールの前で = in front of the goal

If it were a time expression, the context would be very different. For example:

• 試合の前に = before the match

Here, because someone physically stops and asks the teacher, 前 is clearly about location.

The word order is very natural.

Japanese word order is flexible, but the original order is easy to follow:

• 妹は = topic
• ゴールの前で = where
• 止まってしまって、 = first action
• ルールをもう一度先生に聞いた。 = second action

Some parts could move around, especially もう一度, but not all changes sound equally natural.

For example:

• 妹はゴールの前で止まってしまって、先生にルールをもう一度聞いた。
• 妹はゴールの前で止まってしまって、もう一度先生にルールを聞いた。

These are also possible.

So yes, Japanese allows some rearrangement, but the original sentence is already smooth and standard.