Tasuję talię.

Because Polish usually drops subject pronouns when the verb already shows who is doing the action.

In tasuję, the ending -ę already means I. So:

• Tasuję talię. = I’m shuffling the deck.
• Ja tasuję talię. also works, but ja adds emphasis, like I am shuffling the deck.

So the version without ja is the most neutral and natural.

The dictionary form is tasować.

So:

• tasować = to shuffle
• tasuję = I shuffle / I am shuffling

This verb is commonly used for cards, though it can sometimes be used more broadly in contexts of mixing or rearranging.

This is a normal present-tense pattern for many Polish verbs ending in -ować.

For tasować, the present tense is:

• ja tasuję = I shuffle
• ty tasujesz = you shuffle
• on / ona / ono tasuje = he / she / it shuffles
• my tasujemy = we shuffle
• wy tasujecie = you (plural) shuffle
• oni / one tasują = they shuffle

So -ować often changes to -uję, -ujesz, -uje, etc. in the present tense.

It can mean either one, depending on context.

Polish present tense often covers both:

• I shuffle
• I am shuffling

So Tasuję talię. could mean:

• I’m shuffling the deck right now, or
• I shuffle the deck (for example, as part of a routine)

In real conversation, context usually makes it clear.

Because talia is the dictionary form of the noun, but here it is the direct object of the verb tasuję, so it has to go into the accusative case.

• nominative: talia
• accusative: talię

This is a very common pattern for feminine singular nouns ending in -a:

• książka → książkę
• kawa → kawę
• talia → talię

So Tasuję talię uses the correct object form.

It is in the accusative singular.

Polish uses the accusative case for the direct object of many verbs. Since the deck is the thing being shuffled, talia changes to talię.

Structure:

• tasuję = I shuffle
• talię = the deck

So literally, this is [I shuffle] [the deck], with the deck in the accusative.

In card contexts, yes, talia means a deck / pack of cards.

Sometimes speakers make it even more explicit by saying:

• talia kart = a deck of cards

By itself, talia can have other meanings in other contexts, but in a sentence with tasować, the card meaning is the obvious one.

Its most common use is shuffling cards.

So if you are talking about a deck, tasować is exactly the right verb.

For more general mixing, Polish often uses other verbs, especially mieszać:

• mieszać zupę = stir soup
• mieszać składniki = mix ingredients

So tasować is strongly associated with cards or similar rearranging/shuffling.

Yes. Polish word order is more flexible than English because endings show grammatical roles.

The neutral version is:

• Tasuję talię.

But you could also say:

• Talię tasuję.

That version sounds more marked or emphatic, as if contrasting the deck with something else.

So the original sentence is the most normal basic order.

A rough English-friendly guide is:

• tasuję ≈ ta-SOO-yeh(n)
• talię ≈ TA-lyeh(n)

A few useful notes:

• sz is like English sh
• j is like English y
• li before a vowel sounds soft, roughly like ly
• ę is a nasal vowel; at the end of a word, many speakers pronounce it less strongly nasal than learners expect

So Tasuję talię sounds roughly like:

ta-SOO-yeh(n) TA-lyeh(n)

That is only an approximation, but it is a helpful starting point.

Tasować is imperfective.

That means it is used for:

• ongoing actions
• repeated actions
• general statements

So Tasuję talię is naturally imperfective: I’m shuffling the deck / I shuffle the deck.

A common perfective partner is przetasować:

• tasować = to be shuffling / to shuffle in an ongoing or repeated sense
• przetasować = to shuffle through, to shuffle completely, to finish shuffling

So:

• Tasuję talię. = I’m shuffling the deck.
• Przetasuję talię. = I’ll shuffle the deck / I’ll give the deck a complete shuffle.

This imperfective–perfective distinction is very important in Polish verbs.