eoje gongwoneseo ttwidaga neomeojyeosseoyo.

어제 means yesterday, and time expressions in Korean often come near the beginning of the sentence. This sets the time frame first.

Korean is flexible, so other orders are possible, but 어제 at the front is very natural:

• 어제 공원에서 뛰다가 넘어졌어요.
• 공원에서 어제 뛰다가 넘어졌어요.

The first one is more neutral and common.

Here, 에서 marks the place where an action happens.

Since 뛰다 means to run, and running is an action taking place in the park, Korean uses 에서:

• 공원에서 뛰다 = to run in the park

By contrast, 에 is often used for:

• destination: 공원에 가요 = I go to the park
• location with existence: 공원에 사람이 많아요 = There are many people in the park

So in this sentence, 공원에서 is correct because it is the location of the action.

뛰다가 comes from 뛰다 (to run) plus -다가.

The grammar -다가 means something like:

• while doing
• in the middle of doing
• sometimes and then something else happened

So 뛰다가 넘어졌어요 means:

• I was running and then fell
• I fell while running

It shows that the falling happened during the action of running.

-다가 specifically connects two actions and shows that the second action happened during or interrupted the first action.

So:

• 뛰다가 넘어졌어요 = I fell while running / I was running and then fell

If you just say:

• 뛰고 넘어졌어요

that sounds more like:

• I ran and fell

This does not clearly show that the fall happened in the middle of running. -다가 is more precise for interruption or a sudden change.

In Korean, when a verb is followed by -다가, the first verb usually appears in the verb stem form before -다가, not in a full past-tense form.

So:

• 뛰다 → 뛰다가

The past tense is shown in the final verb:

• 넘어졌어요 = fell

That final verb carries the tense for the whole sentence. Since 넘어졌어요 is past tense, the whole event is understood as past.

넘어졌어요 comes from 넘어지다, which means to fall down.

Breakdown:

• 넘어지- = verb stem
• -었- = past tense
• -어요 = polite ending

So:

• 넘어졌어요 = fell / have fallen in polite speech

This is a very common polite everyday form.

-어요 is a polite casual ending, often called the informal polite style. It is very common in daily conversation when speaking politely but not formally.

So 넘어졌어요 sounds natural in everyday situations:

• to a stranger
• to a coworker
• to a teacher
• to someone older

If you made it plain/casual, it would be:

• 어제 공원에서 뛰다가 넘어졌어.

If you made it more formal, it could be:

• 어제 공원에서 뛰다가 넘어졌습니다.

Korean often leaves out the subject when it is obvious from context.

So 어제 공원에서 뛰다가 넘어졌어요 does not explicitly say:

• I fell
• he fell
• she fell

But in normal conversation, the listener usually already knows who the sentence is about.

If you want to add the subject, you could say:

• 제가 어제 공원에서 뛰다가 넘어졌어요. = I fell while running in the park yesterday.

Still, leaving it out is very natural.

Yes. -다가 is very common with many verbs when one action is interrupted by another.

Examples:

• 공부하다가 잠들었어요. = I fell asleep while studying.
• 걷다가 친구를 만났어요. = I met a friend while walking.
• 먹다가 웃었어요. = I laughed while eating.

So in your sentence, the pattern is:

• action 1 + -다가 + action 2

뛰다 usually means to run, but it can also have related meanings depending on context, such as:

• to jump
• to leap
• sometimes even to skip or to beat in expressions like a heart beating

In 공원에서 뛰다가, the most natural meaning is running in the park.

Yes. Using -다가 often gives the feeling that the second action happened unexpectedly during the first action.

So 뛰다가 넘어졌어요 naturally suggests:

• the person was in the middle of running
• then suddenly fell

That makes it sound very natural for describing accidents or interruptions.

Not strange, but often unnecessary.

You could say:

• 저는 어제 공원에서 뛰다가 넘어졌어요.

This is fine if you want to emphasize I or make the subject clear. But in many conversations, Korean prefers to omit 저는 if it is already understood.

So:

• 어제 공원에서 뛰다가 넘어졌어요. = more natural in many contexts
• 저는 어제 공원에서 뛰다가 넘어졌어요. = clearer or slightly more emphasized

A rough breakdown is:

• 어제 = yesterday
• 공원에서 = in the park
• 뛰다가 = while running
• 넘어졌어요 = fell

So the order is basically:

time + place + action/background + main event

Korean sentences often build up context first and put the main verb at the end. That is why 넘어졌어요 comes last.