kaigi no mae ni, kintyousite heya wo urourosite imasita.

会議 means meeting, and 前に after a noun often means before in time.

So:

• 会議の前に = before the meeting

Even though 前 literally means front, Japanese uses it for both:

• physical front: in front of
• time before: before

In this sentence, because 会議 is an event, the meaning is naturally temporal: before the meeting.

In the pattern noun + の + 前に, に is part of the standard expression for before something.

Examples:

• 会議の前に = before the meeting
• 昼ご飯の前に = before lunch
• 出かける前に = before going out

So here, に helps mark the time reference point.

緊張して is the て-form of 緊張する, which means to be nervous / to get tense.

Here, the て-form connects feeling nervous to the main action:

• 緊張して、部屋をうろうろしていました
• being nervous, (someone) was pacing around the room

The て-form can connect actions, states, reasons, or accompanying circumstances. In this sentence, it gives the situation or background: the person was pacing around while nervous / because they were nervous.

Both can work, but they feel slightly different.

• 緊張して simply links the nervous state to the next action
• 緊張していて makes the ongoing state a little more explicit

So:

• 緊張して部屋をうろうろしていました = natural, simple, smooth
• 緊張していて部屋をうろうろしていました = also natural, with a slightly stronger sense of being in that nervous state

In everyday Japanese, the shorter 緊張して is very common.

This is a very common learner question.

Here, を does not mark a direct object in the usual transitive-verb sense. Instead, it marks the space someone moves through or around.

So:

• 部屋をうろうろする = to wander/pacing around the room

This use of を also appears in sentences like:

• 道を歩く = walk along the road
• 公園を走る = run through the park
• 空を飛ぶ = fly through the sky

So 部屋を here means something like through/around the room, not that the room is being acted on as an object.

Yes, 部屋でうろうろしていました is possible, but the nuance is a little different.

• 部屋で focuses on the place where the action happened: in the room
• 部屋を emphasizes moving around within that space

So:

• 部屋でうろうろしていました = was pacing around in the room
• 部屋をうろうろしていました = was pacing around the room

The version with を feels especially natural when the speaker wants to highlight restless movement through the space.

うろうろ is a mimetic or sound-symbolic word that describes wandering around aimlessly, roaming back and forth, or pacing restlessly.

With する, it becomes a verb-like expression:

• うろうろする = to wander around / pace around / loiter about

In this sentence, because the person is nervous before a meeting, うろうろしていました strongly suggests pacing around restlessly rather than casually walking.

〜ていました is the past form of 〜ている, which often shows an ongoing action or state in the past.

So:

• うろうろしていました = was pacing around
• うろうろしました = paced around / wandered around

In this sentence, the speaker is describing what was happening over a period of time before the meeting, so していました is the natural choice. It gives a background scene, not just a single completed action.

The subject is not stated. Japanese often leaves out the subject when it is clear from context.

So this sentence could mean:

• I was pacing around the room nervously before the meeting
• He was pacing around the room nervously before the meeting
• She was pacing around the room nervously before the meeting

You only know the subject from the surrounding context. If this appeared in a personal story, I would be a very natural guess.

No, it is not strictly necessary, but it is very natural.

The comma helps separate the introductory time phrase:

• 会議の前に、緊張して部屋をうろうろしていました。

It makes the sentence easier to read and gives a small pause, similar to:

• Before the meeting, ...

So the comma is a style/readability choice, not a grammar requirement.

No. In normal Japanese, this would usually be written without spaces:

• 会議の前に、緊張して部屋をうろうろしていました。

The spaces are often added in learning materials to make it easier to see word boundaries and particles. They are not standard in ordinary Japanese writing.