Młody mężczyzna czeka przy okienku.

Because Polish has a small group of masculine nouns for male people that end in -a.

So mężczyzna is grammatically masculine, even though its ending may look feminine to an English-speaking learner.

You can see that it is masculine from agreement:

• ten mężczyzna = this man
• młody mężczyzna = young man
• in the past tense: mężczyzna czekał = the man was waiting

So the ending can be misleading, but the grammar is masculine.

Because adjectives in Polish agree with the noun’s grammatical gender, not just with how the noun looks.

Even though mężczyzna ends in -a, it is still a masculine noun, so the adjective must also be masculine:

• młody mężczyzna = young man
• młoda kobieta = young woman

This is a very common pattern with male-person nouns like mężczyzna.

Czeka is the 3rd person singular present tense form of czekać = to wait.

So it means:

• he waits
• or he is waiting

Polish present tense often covers both the English simple present and present continuous, so context decides which English translation sounds best.

Also, czekać is imperfective, which fits an ongoing action or state like waiting.

Because the preposition przy requires the locative case.

The basic form is:

• okienko = nominative

After przy, it changes to locative:

• przy okienku

So the change is happening because of the preposition, not because the word itself means something different.

Przy takes the locative.

That is why:

• okienko becomes okienku
• okno becomes oknie
• stół becomes stole

In this sentence:

• przy okienku = by / at the window

A very useful rule to remember is: przy + locative.

Not necessarily.

Literally, okienko is a diminutive of okno, so it can mean little window. But in many everyday situations, okienko means a service window, ticket window, or counter window.

So in this sentence, przy okienku most likely means something like:

• at the service window
• at the counter window
• by the ticket window

That is often more natural than imagining an actual small house window.

Both are possible, but they do different jobs.

• czekać na + accusative tells you what or whom someone is waiting for

  • Czeka na autobus. = He is waiting for the bus.

• przy + locative tells you where someone is waiting

  • Czeka przy okienku. = He is waiting by/at the window.

So in your sentence, przy okienku is giving the location, not the object of waiting.

No. Polish has no articles like English a/an/the.

So Młody mężczyzna can mean:

• a young man
• the young man

The exact meaning depends on context.

If Polish speakers want to make something more clearly definite, they usually do it through context, word order, or words like ten = this.

Yes. Polish word order is fairly flexible.

The sentence:

• Młody mężczyzna czeka przy okienku.

is a neutral, natural order.

But you could also say:

• Przy okienku czeka młody mężczyzna.

That version puts more attention on where he is.

So the roles in the sentence are mostly shown by endings and grammar, not only by word order. Still, word order affects focus and style.

A rough English-friendly guide is:

MWO-dy men-SHCHIZ-na CHE-ka pshih o-KYEN-koo

A few key points:

• ł sounds like English w
• cz sounds like ch in chop
• ż/rz sounds like zh in measure
• y is a Polish vowel with no exact English equivalent
• stress is usually on the second-to-last syllable

If you want a more technical version, the pronunciation is approximately:

[ˈmwɔ.dɨ mɛ̃ʂˈt͡ʂɨz.na ˈt͡ʂɛ.ka pʂɨ ɔˈkʲɛn.ku]

Yes, but it would change the meaning.

• przy oknie = by the window in the ordinary sense
• przy okienku often suggests at a small/service window, such as in a station, office, or bank

So if you mean a normal physical window in a room, oknie is likely better. If you mean a counter or service window, okienku is very natural.