Learn Hardcore Polish: Po obiedzie musimy posprzątać kuchnię. - After dinner we must clean up the kitchen.

Because po (meaning “after” in time expressions) governs the Locative case. The noun obiad (dinner/lunch) in the Locative singular is obiedzie. The consonant softens: d + -zie. Examples:

po obiedzie = after lunch
Compare: ogród → w ogrodzie (in the garden), świat → o świecie (about the world)

Why is it kuchnię and not kuchnia?

Kuchnię is the Accusative singular of the feminine noun kuchnia (kitchen). It’s the direct object of the verb (what we have to clean). Mini-pattern:

Nominative: kuchnia
Accusative: kuchnię

What’s the difference between posprzątać and sprzątać?

Aspect:

posprzątać = perfective (to clean up, get it cleaned — a completed result)
sprzątać = imperfective (to clean, be cleaning — an ongoing or habitual action) In this sentence, musimy posprzątać implies “we have to get the kitchen cleaned (to completion).”
If you said musimy sprzątać, it would sound like “we have to (regularly) clean” or “we must be cleaning (as a process).”

Can I change the word order?

Yes, Polish word order is flexible. All are natural, with slight differences in focus:

Po obiedzie musimy posprzątać kuchnię. (time frame up front)
Musimy posprzątać kuchnię po obiedzie. (neutral)
Kuchnię musimy posprzątać po obiedzie. (focuses on “the kitchen”) Meaning stays the same.

How do I say “We don’t have to clean the kitchen after lunch”?

Use negation with a modal plus an infinitive. Most natural:

Nie musimy sprzątać kuchni po obiedzie. Notes:
With negation in Polish, the direct object often appears in the Genitive: kuchni (not Accusative kuchnię).
You can also hear: Nie musimy posprzątać kuchni, but imperfective sprzątać sounds more neutral for “don’t have to (in general).”

How do I pronounce posprzątać?

Stress: po-SPRZĄ-tać (penultimate syllable).
prz is pronounced roughly like “psh.”
ą before t sounds like “on”: sprzątać ≈ “SPRZON-tach.”
Final ć is a soft “tch” sound. Approximation: “poh-spsh-ON-tatch.”
IPA (approx.): [pɔˈspʂɔntat͡ɕ]

How do I pronounce kuchnię?

Stress on the first syllable: KUCH-nię.
ch = a hard “h” like in German “Bach” .
ń ≈ Spanish ñ (ny).
ę at the end (after ń) is often only lightly nasal, sounding close to “e.” Approximation: “KOOH-hnyeh.”
IPA (approx.): [ˈkuxɲɛ̃] ~ [ˈkuxɲe]

What exactly does obiad mean — lunch or dinner?

In Polish culture:

obiad = the main hot meal, typically in the early/mid afternoon (often translated as “dinner” or “lunch” depending on context).
If you literally mean a light midday meal, that’s lunch (loanword) → po lunchu.
Evening meal is kolacja → po kolacji.

Why use perfective (posprzątać) after musimy (present tense)?

With obligations to complete a single task, Polish tends to use a perfective infinitive after modals: musimy posprzątać = we must get it done.
Use the imperfective (sprzątać) for habits or ongoing activities: Musimy sprzątać kuchnię w każdy piątek (We have to clean the kitchen every Friday).

Could I say posprzątać w kuchni instead of posprzątać kuchnię?

Yes, but the nuance changes:

posprzątać kuchnię = clean the kitchen (the whole room, as the object).
posprzątać w kuchni = clean/tidy in the kitchen (do cleaning activities there, not necessarily the entire room).

How do I ask “Do we have to clean the kitchen after lunch?” in Polish?

Use czy or just rising intonation:

Czy musimy posprzątać kuchnię po obiedzie?
Musimy posprzątać kuchnię po obiedzie? (colloquial)

What’s the difference between musimy, powinniśmy, and trzeba?

musimy (from musieć) = we must / have to (strong obligation).
powinniśmy (from powinien) = we should / ought to (recommendation).
trzeba (impersonal) = it’s necessary/one needs to; e.g., Po obiedzie trzeba posprzątać kuchnię.

Where is the stress in each word?

Polish stress is nearly always on the penultimate syllable of a word:

Po o-bie-dzie
mu-si-my
po-sprzą-tać
ku-chnię (two syllables, so stress falls on the first)

Can you show the present forms of musieć?

Present tense:

ja muszę
ty musisz
on/ona/ono musi
my musimy
wy musicie
oni/one muszą Example: Po obiedzie musimy posprzątać kuchnię.
You can add my for emphasis: My musimy…

How would I say it in the past or future?

Past (we had to):
- mixed/men: Po obiedzie musieliśmy posprzątać kuchnię.
- women only: Po obiedzie musiałyśmy posprzątać kuchnię.
Future (we will have to):
- mixed/men: Po obiedzie będziemy musieli posprzątać kuchnię.
- women only: Po obiedzie będziemy musiały posprzątać kuchnię.