Syn biegnie do zjeżdżalni, a potem woła mnie z samej góry.

Syn is in the nominative case because it is the subject of the sentence — the person doing the action.

• syn = son (subject form)
• syna can be genitive or accusative in other contexts
• synem = instrumental

In Syn biegnie..., the son is the one who runs, so nominative is required.

Biegnie is the 3rd person singular present tense of biec (to run).

It matches syn because syn is:

• 3rd person = he
• singular = one person

So:

• ja biegnę = I run / am running
• ty biegniesz = you run
• on / syn biegnie = he / the son runs

In Polish, the present tense often covers both English runs and is running, depending on context.

The preposition do usually means to or toward, and it requires the genitive case.

The noun is:

• zjeżdżalnia = slide

After do, it changes to:

• do zjeżdżalni

So this is a standard pattern:

• do domu = to the house / home
• do szkoły = to school
• do zjeżdżalni = to the slide

Zjeżdżalnia usually means a slide, especially a playground slide.

It comes from the idea of sliding down. In this sentence, it clearly sounds like a child running to a slide in a playground or similar place.

A learner may notice that Polish often forms nouns like this from verbs or motion-related ideas, but the key thing here is simply:

• zjeżdżalnia = slide

Both a potem and i potem can be translated as and then, but they are not always used in exactly the same way.

Here, a potem is very natural because it links two actions in sequence and gives a slight sense of "and then after that" or "and next".

• Syn biegnie do zjeżdżalni, a potem woła mnie...

It sounds smooth and narrative.

Very roughly:

• i = and
• a = and / while / whereas / and then, depending on context

In this sentence, a potem is a natural storytelling connector.

Because wołać kogoś (to call someone) takes the accusative case, not the dative.

So:

• mnie = accusative/genitive form of ja
• mi = dative form

Here the son is calling me, so Polish uses the direct object:

• woła mnie = calls me / shouts for me

Compare:

• Daje mi książkę = He gives me a book
  (mi is dative because I am the indirect object)

This is a very common question.

For I / me, Polish has different case forms:

• ja = I
• mnie / mnie = me (accusative/genitive, among other uses)
• mi / mnie = to me (dative)

In this sentence:

• woła mnie = he calls me

You would use mi with verbs that take an indirect object, for example:

• Powiedział mi = he told me
• Dał mi = he gave me

So the form depends on what the verb requires.

This phrase means something like from the very top.

There are two things happening here:

1. z means from
2. z requires the genitive case

The noun is:

• góra = hill, mountain, top, upper part

After z, it becomes:

• z góry = from the top / from above

Then samej adds emphasis:

• z samej góry = from the very top

So samej is the genitive singular feminine form of sam and agrees with góry.

Here samej adds emphasis. It means something like:

• very
• very same
• right at the

So:

• z góry = from the top
• z samej góry = from the very top

This does not mean alone here, even though forms of sam can sometimes mean alone in other contexts.

Here it is intensifying the location.

Because the preposition z in the sense of from takes the genitive case.

So:

• góra = top
• z góry = from the top

But górze is a different case form, usually locative or dative, used in other structures such as:

• na górze = at the top / upstairs

So compare:

• z góry = from the top
• na górze = at the top

Both are correct in the right context, but they mean different things.

Yes, but it would mean something slightly different.

• z samej góry = from the very top
• na samej górze = at the very top

In your sentence, the son is calling from that place, so z samej góry works very well.

If you said:

• Syn jest na samej górze
  that would mean:
• The son is at the very top

So the choice depends on whether you want to express:

• location → na samej górze
• movement/source → z samej góry

It can be either, depending on context.

Wołać often means:

• to call
• to call out
• to shout for someone

In this sentence, because the son is up high on the slide, woła mnie probably suggests:

• he is calling out to me
• he is shouting to me

So wołać is broader than just saying someone’s name on the phone, for example.

Yes. Polish often drops subject pronouns and even noun subjects when the meaning is clear from context.

So you could say:

• Biegnie do zjeżdżalni, a potem woła mnie z samej góry.

This would mean:

• He runs to the slide, and then calls me from the very top.

However, keeping syn is useful if you want to make the subject explicit or introduce him clearly into the sentence.

The neutral order here is very natural:

• Syn — subject
• biegnie — verb
• do zjeżdżalni — direction phrase
• a potem — connector
• woła mnie — verb + object
• z samej góry — source/location phrase

Polish word order is more flexible than English, so changes are possible for emphasis. For example:

• Syn biegnie do zjeżdżalni, a potem woła mnie z samej góry.
  neutral, natural

• Z samej góry woła mnie.
  stronger focus on from the very top

But the original sentence sounds very normal and idiomatic.