To jest mój ostatni dzień w nowej pracy.

To jest means this is or it is in this kind of sentence.

• to = this / it
• jest = is

So To jest mój ostatni dzień... is a very natural way to say This is my last day...

In everyday Polish, people also often shorten it to To mój ostatni dzień w nowej pracy. Leaving out jest is common in informal speech.

Because dzień is a masculine singular noun, and both mój and ostatni must agree with it.

So:

• dzień = masculine singular
• mój = masculine singular form of my
• ostatni = masculine singular form of last

Polish adjectives and possessive words change their form depending on the noun’s:

• gender
• number
• case

That is why you get:

• mój ostatni dzień not
• moje ostatnie dzień

Yes, dzień is masculine.

In Polish, grammatical gender is not always obvious from meaning. A noun can be masculine, feminine, or neuter based on its grammatical pattern, not whether the thing itself is male or female.

dzień is a masculine noun, even though it ends in a soft consonant sound. That is why it takes masculine agreement:

• mój dzień
• ostatni dzień
• ten dzień

It can mean either in different contexts, which is something learners often notice.

In this sentence, ostatni dzień means final day or last day.

In other contexts, ostatni can also mean the previous/most recent one, for example:

• W ostatnim tygodniu = In the last week / In the past week

So the exact meaning depends on context. Here, with dzień w pracy, it is naturally understood as final day at work.

After w meaning in or at, Polish usually uses the locative case.

So:

• dictionary form: praca = work / job
• locative singular: pracy

That is why you say:

• w pracy = at work
• w nowej pracy = in/at the new job

The adjective also has to match the noun in case, so:

• nowa praca → nominative
• w nowej pracy → locative

Because the adjective has to agree with pracy, which is in the locative singular.

The base form is:

• nowa praca = new job / new work

But after w, both words change:

• w nowej pracy

So:

• nowa → nowej
• praca → pracy

This is normal Polish adjective-noun agreement.

Because praca is not the subject here. It comes after the preposition w, and w requires the locative in this meaning.

Compare:

• To jest nowa praca. = This is a new job.
  Here praca is in the basic form.

• Jestem w nowej pracy. = I am at/in a new job.
  Here praca changes to pracy because of w.

Good question. w nowej pracy literally means in/at the new job, not explicitly in my new job.

However, Polish often leaves out possessive words like my when the meaning is already clear from context. Since the sentence already says mój ostatni dzień, it is very natural to understand that this is my job.

So both are possible:

• To jest mój ostatni dzień w nowej pracy. = natural, often understood as This is my last day at my new job
• To jest mój ostatni dzień w mojej nowej pracy. = more explicit, adds my

The version without mojej sounds perfectly normal.

Because Polish normally uses w pracy for at work.

This is just the standard preposition used with praca in this meaning:

• Jestem w pracy. = I’m at work.
• Byłem w pracy cały dzień. = I was at work all day.

Using na here would sound wrong in standard Polish.

Yes. That is very common.

Both are correct:

• To jest mój ostatni dzień w nowej pracy.
• To mój ostatni dzień w nowej pracy.

The version without jest is a little shorter and often sounds more natural in conversation.

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

The most natural version is:

• To jest mój ostatni dzień w nowej pracy.

You can move things for emphasis, but the meaning or style may shift. For example:

• W nowej pracy to jest mój ostatni dzień. = possible, but more marked
• Mój ostatni dzień w nowej pracy. = works as a short statement or caption

For a learner, it is best to stick with the original order until you get comfortable with emphasis patterns.

Because Polish has no articles.

English says:

• my last day
• the new job
• a new job

Polish does not use words equivalent to a/an/the in the same regular way. The meaning comes from context instead.

So:

• dzień can mean a day or the day
• nowa praca can mean a new job or the new job

Context tells you which one is meant.

Mostly yes, but there are some small differences.

• dzień = day
• praca can mean work or job, depending on context

In this sentence, w nowej pracy is most naturally understood as at/in a new job or at a new workplace.

So praca is a broad word. It can refer to:

• work in general
• a job
• employment
• sometimes even a piece of work, depending on context

dzień is roughly pronounced like jeny said very quickly, but that is only an approximation.

A few helpful points:

• dz here sounds like a soft j/dj sound
• ie softens the consonant before it
• ń is a soft n, similar to the ny sound in canyon

A rough English-friendly guide:

• dzień ≈ jeny / djeny, but with only one syllable

It is best learned by listening, because Polish soft consonants do not match English exactly.