To nie jest zwykły dzień w pracy.

Here to means something like this or it in English.

In sentences of the pattern To jest... / To nie jest..., Polish often uses to as a kind of neutral subject:

• To jest dom. = This is a house.
• To jest ważne. = This/It is important.

So in To nie jest zwykły dzień w pracy, to introduces the whole statement: This is not an ordinary day at work.

In Polish, nie goes directly before the verb it negates.

So:

• jest = is
• nie jest = is not

That is the normal way to negate być (to be):

• To jest dobre. = This is good.
• To nie jest dobre. = This is not good.

So To nie jest... is the natural equivalent of This is not...

This is a very useful grammar point.

After to jest / to nie jest, Polish usually uses the nominative form, not the instrumental.

So:

• To jest dzień.
• To nie jest zwykły dzień.

That is why you get dzień.

By contrast, with a personal subject like on / ona / Jan, Polish often uses the instrumental for noun complements:

• On jest lekarzem. = He is a doctor.

So a learner may notice:

• To jest dobry dzień. — nominative
• On jest dobrym lekarzem. — instrumental

In your sentence, dzień stays nominative because of the to jest structure.

Because the adjective has to agree with the noun it describes.

Here the noun is dzień (day), which is:

• masculine
• singular
• nominative

So the adjective must also be masculine singular nominative:

• zwykły dzień = an ordinary day

If the noun changed, the adjective would change too:

• zwykła praca = ordinary work/job
• zwykłe miejsce = ordinary place

This agreement is one of the key features of Polish adjectives.

Because the preposition w requires a different case here.

In this sentence, w means in / at in a location sense, so it takes the locative case.

The noun praca changes like this:

• dictionary form: praca
• after w for location: w pracy

So:

• praca = work
• w pracy = at work / in work

This is very common:

• w domu = at home
• w szkole = at school
• w pracy = at work

Because that is the natural English expression, even though Polish uses w, which often corresponds to in.

Languages do not always match prepositions exactly. In Polish:

• w pracy literally looks like in work
• but the natural English meaning is at work

So this is something to learn as a phrase:

• jestem w pracy = I’m at work
• spotkamy się w pracy = we’ll meet at work

Polish word order is more flexible than English, but not every order sounds equally natural.

The most neutral version is:

• To nie jest zwykły dzień w pracy.

You might also hear variations for emphasis, but this basic order is the safest for learners.

Why this order works well:

• To sets up the statement
• nie jest gives the verb and negation
• zwykły dzień gives the main idea
• w pracy adds the context

If you move things around too much, the sentence may sound marked, poetic, or just unnatural.

Not in normal standard Polish if you want the same meaning.

To is important here because it gives the sentence a subject-like starting point: This/It is not...

Without to, Nie jest zwykły dzień w pracy sounds incomplete or unnatural.

So for this kind of sentence, keep to:

• To jest problem.
• To nie jest problem.
• To nie jest zwykły dzień w pracy.

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

So zwykły dzień can mean:

• an ordinary day
• the ordinary day
• sometimes just ordinary day

The exact meaning depends on context.

In your sentence, English naturally uses an:

• This is not an ordinary day at work.

But Polish simply says:

• To nie jest zwykły dzień w pracy.

That is completely normal.

They can overlap, but they are not always identical.

• zwykły usually means ordinary, usual, nothing special
• normalny usually means normal, not strange, as expected

In this sentence, zwykły is a very good choice because the idea is:

This is not just an ordinary, routine day at work.

If you used normalny, the nuance would shift a bit more toward:

This is not a normal day at work.

That is also possible in some contexts, but zwykły better matches ordinary.

A rough pronunciation guide is:

to nye yest zvih-kwi djen f pra-tsih

A few key sounds:

• nie sounds like nye
• jest sounds roughly like yest
• zwykły is tricky:
  • zw sounds like zv
  • y is not like English ee; it is a harder vowel
  • ł sounds like English w
• dzień starts with a soft sound close to djen
• w pracy is pronounced roughly f pra-tsih, because w is often pronounced like f before a voiceless consonant such as p

If you want, you can break it into chunks:

• To nie jest
• zwykły dzień
• w pracy

That usually makes it easier to say smoothly.

Yes, in this sentence it is perfectly natural.

• dzień w pracy = a day at work

It means a day spent in the work setting.

You may also meet other expressions depending on context, but here zwykły dzień w pracy is a very normal phrase and matches the English idea well.

So the full phrase:

• zwykły dzień w pracy

means:

• an ordinary day at work

Yes, depending on the nuance you want.

Possible alternatives include:

• normalny = normal
• zwyczajny = ordinary / everyday
• typowy = typical

For example:

• To nie jest normalny dzień w pracy. = This is not a normal day at work.
• To nie jest typowy dzień w pracy. = This is not a typical day at work.

But zwykły is a very natural, common choice if you want the sense of ordinary or nothing unusual.