Znáš nějakou píseň?

Znáš is the 2nd person singular present form of the verb znát (to know / be familiar with).

So znáš means you know when speaking to one person informally.

• já znám = I know
• ty znáš = you know
• on/ona zná = he/she knows

In this sentence, it is asking one person: Do you know ... ?

Czech does not usually need an auxiliary like do/does to make a question.

English:

• Do you know any song?

Czech:

• Znáš nějakou píseň?

A statement and a question can have the same word order in Czech, and the question meaning is usually shown by:

• intonation in speech
• a question mark in writing
• sometimes context

So Znáš nějakou píseň. would be a statement, while Znáš nějakou píseň? is a question.

Because nějakou must agree with píseň in gender, number, and case.

Here:

• píseň is a feminine singular noun
• it is the direct object of znáš
• direct objects are often in the accusative case

So the adjective/pronoun nějaký (some / any) changes to the feminine singular accusative form:

• masculine animate: nějakého
• masculine inanimate: nějaký
• feminine: nějakou
• neuter: nějaké

That is why we get nějakou píseň.

Yes. Píseň is the accusative singular form here.

The dictionary form is also píseň, which is nominative singular, so in this case the form happens to look the same in nominative and accusative.

This is common with some Czech feminine nouns.

So in:

• To je píseň. = That is a song. → nominative
• Znáš nějakou píseň? = Do you know any song? → accusative

the noun looks the same, but its role in the sentence is different.

Píseň is a feminine noun. It belongs to a declension pattern used for many feminine nouns ending in a consonant, often called the kost type, though píseň has a slightly less straightforward paradigm than very regular examples.

Some forms are:

• nominative singular: píseň
• genitive singular: písně
• dative singular: písni
• accusative singular: píseň
• nominative plural: písně

So yes, from an English speaker’s point of view, it may feel a bit irregular because the ending is not as transparent as nouns ending in -a like žena.

In this sentence, nějakou can often be understood as some or any, depending on context.

So:

• Znáš nějakou píseň? can mean Do you know any song?
• or more naturally in English, often Do you know a song? / Do you know any songs? depending on the situation

The word nějaký / nějaká / nějakou often suggests:

• some kind of
• some
• any
• a certain

It is a bit flexible, and English may translate it differently depending on context.

Nějakou and některou are similar, but not the same.

• nějakou píseň = some / any song
• některou píseň = a particular one out of several / one of the songs

So nějakou is more general and natural if you are simply asking whether the person knows any song at all.

Using některou would suggest choosing from a set:

• Znáš některou z těch písní? = Do you know any of those songs?

Yes. Znáš is informal singular, used with ty.

If you want to speak formally to one person, or politely, Czech usually uses the plural form:

• Znáte nějakou píseň? = Do you know any song? / Do you know a song?

So:

• Znáš = informal you (one person)
• Znáte = formal you (one person) or plural you (more than one person)

Yes. Czech word order is more flexible than English.

The neutral version is:

• Znáš nějakou píseň?

But you may also hear:

• Nějakou píseň znáš?

This can slightly change the emphasis. For example:

• Znáš nějakou píseň? = neutral question
• Nějakou píseň znáš? = emphasizes some song / any song at all

Even though word order can move around, not every version sounds equally natural in every context.

A rough pronunciation guide for English speakers is:

• Znáš ≈ znaash
• nějakou ≈ nyeh-yah-koh
• píseň ≈ pee-señ (the final ň is a soft n, like Spanish ñ, but lighter)

A few details:

• á is a long vowel
• í is a long vowel
• š sounds like sh
• ň is a soft ny sound

Stress in Czech is usually on the first syllable of each word:

• ZNÁŠ
• NĚ-ja-kou
• PÍ-seň

Czech speakers can definitely say Znáš nějakou píseň?, and it is grammatical and natural in the right context.

However, depending on the situation, they might also say:

• Znáš nějaké písně? = Do you know any songs?
• Umíš nějakou píseň? = Do you know a song (for example, how to sing or perform it)?

So singular vs. plural depends on what exactly is meant:

• nějakou píseň = one song
• nějaké písně = some songs

This is an important difference.

• znát píseň usually means to know a song / be familiar with it
• umět píseň often suggests to know how to sing it / have it learned

So:

• Znáš nějakou píseň? = Do you know any song? / Are you familiar with any song?
• Umíš nějakou píseň? = Do you know a song (by heart, so you can sing or perform it)?

In real life, the best choice depends on context. If someone asks you to sing something, umíš nějakou píseň? may be more appropriate.

No. Czech usually leaves out subject pronouns when they are already clear from the verb form.

So:

• Znáš nějakou píseň? is the normal way
• Ty znáš nějakou píseň? is possible, but it adds emphasis, contrast, or emotion

For example:

• Ty znáš nějakou píseň? Já ne. = You know a song? I don’t.

Because znáš already tells us the subject is you (singular, informal), the pronoun is not necessary.