Muszę sortować garderobę.

Muszę means I must, I have to, or I need to.

It is the 1st person singular form of musieć (to have to / must).
So:

• muszę = I have to
• musisz = you have to
• musi = he/she/it has to

In this sentence, Muszę sortować garderobę means that the speaker feels obligation or necessity.

Because in Polish, the verb form already shows who the subject is.

Muszę already means I have to, so ja (I) is usually unnecessary. Polish often drops subject pronouns unless you want extra emphasis or contrast.

So:

• Muszę sortować garderobę. = normal, natural
• Ja muszę sortować garderobę. = I have to sort the wardrobe/clothes, maybe stressing that it is me and not someone else

Because after muszę, Polish normally uses another verb in the infinitive.

This is similar to English I have to sort. In Polish, you simply put the infinitive after muszę:

• Muszę pracować. = I have to work.
• Muszę iść. = I have to go.
• Muszę sortować garderobę. = I have to sort the wardrobe/clothes.

There is no extra word like English to before the second verb.

Sortować is imperfective, and posortować is perfective.

Very roughly:

• sortować focuses on the process, activity, or repeated action
• posortować focuses on completing the action

So:

• Muszę sortować garderobę. can suggest I need to do some sorting / I need to be sorting through it
• Muszę posortować garderobę. more clearly suggests I need to get it sorted / finish sorting it

Both can be possible, but they highlight different things. Learners often meet the imperfective first because it is the basic dictionary pair in these kinds of explanations.

Because garderoba is the direct object of the verb, so it changes to the accusative case.

Garderoba is a feminine noun. In the singular, many feminine nouns ending in -a change to -ę in the accusative:

• nominative: garderoba
• accusative: garderobę

So:

• To jest garderoba. = This is a wardrobe / dressing room / collection of clothes.
• Sortuję garderobę. = I am sorting the wardrobe/clothes.

This is a very common pattern in Polish:

• książka → książkę
• kawa → kawę
• szafa → szafę

Garderoba can mean a few related things depending on context, such as:

• wardrobe
• clothes / clothing collection
• dressing room
• sometimes cloakroom

So the exact English translation depends on the situation. In a sentence like Muszę sortować garderobę, it often suggests sorting through clothes or organizing a wardrobe/clothing collection.

This is a good reminder that Polish words do not always match one single English word perfectly.

Yes. Polish word order is more flexible than English word order because grammatical endings carry a lot of information.

The neutral order here is:

• Muszę sortować garderobę.

But you could also hear:

• Garderobę muszę sortować.
• Sortować muszę garderobę.

These alternatives can sound marked, emphatic, or dependent on context. For example, fronting garderobę may emphasize the wardrobe/clothes specifically.

For a learner, the original order is the safest and most natural default.

A rough pronunciation guide is:

MOO-sheh sor-TOH-vach gar-deh-ROH-beh

A few useful points:

• sz sounds like English sh
• ę at the end is often pronounced approximately like eh or a nasalized vowel, depending on speech style
• ć sounds a bit like a soft ch / tch, but lighter
• stress in Polish usually falls on the second-to-last syllable

So the main stresses are roughly:

• MU-szę
• sor-to-WAĆ
• gar-de-RO-bę

Yes, that is grammatically correct.

Adding ja is possible, but it usually adds emphasis. For example:

• Ja muszę sortować garderobę, a ty możesz odpoczywać.
  = I have to sort the wardrobe, and you can rest.

Without emphasis, Polish normally prefers just:

• Muszę sortować garderobę.

So the version without ja is usually more natural in everyday speech.

It often overlaps with English must, have to, and need to, but the exact force depends on context and tone.

Muszę can express:

• real obligation: I have to
• necessity: I need to
• strong intention or urgency: I really must

So in many everyday situations, translating it as I have to is the most natural choice. But sometimes I must works better if the feeling is stronger.

That is normal: one Polish form can match several English expressions.

Yes, it is grammatically natural.

The only thing that depends on context is the noun garderoba, because in real life some speakers might choose a different word depending on what exactly they mean:

• ubrania = clothes
• szafa = wardrobe / closet
• garderoba = wardrobe, dressing room, clothing collection

So Muszę sortować garderobę is correct, but in some contexts a native speaker might prefer a more specific noun. The grammar of the sentence itself is perfectly fine.