Arkadaşım panik olunca, ben ona su verdim.

Arkadaşım means my friend.

It is made of:

• arkadaş = friend
• -ım = my

So:

• arkadaş = friend
• arkadaşım = my friend

Turkish often uses possessive endings instead of separate words like my, your, his/her.

In Turkish, many states or conditions are expressed with olmak (to be / to become) plus a noun or borrowed word.

So:

• panik = panic
• panik olmak = to panic / to become panicked

This is a very normal structure in Turkish. Similar patterns include:

• hasta olmak = to become ill
• mutlu olmak = to become happy
• hazır olmak = to be ready

In this sentence, panik olunca means something like when my friend panicked or when my friend got panicked/upset.

The ending -ınca / -ince / -unca / -ünce usually means when, once, or upon doing something.

Here:

• olmak = to become / to be
• olunca = when it happened / when he or she became

So panik olunca means when he/she panicked.

This ending often gives a time relationship, but it can also imply a reason depending on context. In this sentence, it naturally feels like:

• When my friend panicked, I gave him/her water.

Both olunca and olduğunda can mean when in many contexts, but they feel a little different.

• olunca is often more direct and conversational: when/once it happened
• olduğunda can sound a bit more neutral, formal, or descriptive: when it happened

In everyday speech, panik olunca is very natural.

So this sentence is completely normal spoken Turkish.

Yes. The subject is already clear from verdim.

• verdim = I gave
• the -m ending already shows I

So ben is not required for grammar. It is included for emphasis or clarity.

Compare:

• Arkadaşım panik olunca, ona su verdim. = When my friend panicked, I gave him/her water.
• Arkadaşım panik olunca, ben ona su verdim. = When my friend panicked, I gave him/her water.

Adding ben can emphasize that I was the one who acted.

Because ona is the dative form, meaning to him / to her / to it.

• o = he / she / it
• ona = to him / to her / to it

The verb vermek (to give) usually takes:

• the thing given
• the person receiving it in the dative case

So:

• su verdim = I gave water
• ona su verdim = I gave water to him/her

The -a ending is the dative ending here.

That n is a buffer consonant.

The pronoun o takes case endings, but Turkish often inserts n between the pronoun and the ending:

• o = he/she/it
• ona = to him/her/it
• onu = him/her/it
• onda = on him/her/it, at his/her place
• ondan = from him/her/it

So ona is not o + a directly in pronunciation; Turkish uses n to connect them smoothly.

Because here su is the direct object, but it is indefinite.

In Turkish, an indefinite direct object usually appears with no accusative ending:

• su verdim = I gave water

If it were specific, it would usually take the accusative:

• suyu verdim = I gave the water / I gave the water that we know about

So in this sentence, su is just some water / water, not a specifically identified water.

Verdim consists of:

• ver- = give
• -di = past tense
• -m = I

So:

• verdim = I gave

This is a very common Turkish tense pattern:

• geldim = I came
• yaptım = I did
• aldım = I took
• verdim = I gave

Yes. -di is the simple past tense and usually refers to a completed action.

So verdim tells you that the act of giving water happened and was completed in the past.

The sequence in the sentence is:

1. Arkadaşım panik olunca = when my friend panicked
2. ben ona su verdim = I gave him/her water

So the panic happened first, and the giving happened in response.

No, Turkish word order is flexible, although some orders are more natural than others.

This sentence:

• Arkadaşım panik olunca, ben ona su verdim.

is very natural.

You could also say:

• Ben arkadaşım panik olunca ona su verdim.
• Ona arkadaşım panik olunca su verdim.

But changing the order can change the emphasis or make the sentence sound less neutral.

The most neutral pattern here is:

• subordinate clause first: Arkadaşım panik olunca
• main clause after it: ben ona su verdim

The comma separates the subordinate clause from the main clause.

• Arkadaşım panik olunca = subordinate clause
• ben ona su verdim = main clause

This is similar to English writing in sentences like:

• When my friend panicked, I gave him water.

In Turkish, the comma is helpful and very natural here, especially when the when-clause comes first.

Yes, sometimes -ınca/-ince can feel a bit causal as well as temporal.

So depending on context, Arkadaşım panik olunca, ben ona su verdim can feel like:

• When my friend panicked, I gave him/her water
• or slightly: Since my friend panicked, I gave him/her water

But the most straightforward reading is still when.

The idea is that the panic created the situation in which the speaker responded.

Yes, if the context already makes it clear.

For example:

• Panik olunca, ona su verdim.

This could mean When he/she panicked, I gave him/her water, if the listener already knows who panicked.

But in your sentence, arkadaşım is included to make it explicit: my friend was the one who panicked.