Bez identyfikatora nie mogę wejść do biura dyrektora.

Because bez (without) requires the genitive case in Polish.

• identyfikator = nominative
• identyfikatora = genitive

So:

• bez identyfikatora = without an ID / without the ID

This is a very common pattern to remember:

• bez paszportu = without a passport
• bez biletu = without a ticket
• bez problemu = without a problem

Because wejść is the perfective verb, and here it means to enter / to get in as a single completed action.

• wejść = to enter, to go in once, successfully
• wchodzić = to be entering / to enter repeatedly / generally

In this sentence, the speaker means:

• I can't get into the director's office

That is a single action, so wejść is the natural choice.

Compare:

• Nie mogę wejść do biura. = I can’t enter the office.
• Nie mogę wchodzić do tego pokoju. = I’m not allowed to go into that room / I can’t be going into that room.

Mogę is the 1st person singular present tense of móc (can / to be able to).

So:

• mogę = I can
• nie mogę = I can’t

Other forms include:

• możesz = you can
• może = he/she/it can
• możemy = we can

So nie mogę wejść literally means I cannot enter.

Wejść do means to enter into / to go into a place.

It is built like this:

• wejść = to enter
• do = into / to
• do + genitive

So:

• wejść do biura = to enter the office
• wejść do domu = to go into the house
• wejść do pokoju = to go into the room

This is a very common pattern in Polish.

Because the preposition do requires the genitive case.

• biuro = nominative
• biura = genitive

So:

• do biura = into the office / to the office

Compare:

• do sklepu = to the shop
• do szkoły = to school
• do samochodu = into the car

Yes. Biura dyrektora means the director’s office or more literally the office of the director.

Here both nouns are in forms that show relationship:

• biura = of the office / to the office, depending on structure
• dyrektora = of the director

In this sentence, do biura dyrektora means:

• into the director’s office

Polish often expresses possession with a noun in the genitive, instead of using an apostrophe like English does.

Compare:

• samochód nauczyciela = the teacher’s car
• gabinet lekarza = the doctor’s office
• biuro dyrektora = the director’s office

Mostly because it means director’s / of the director.

In do biura dyrektora:

• do directly governs biura
• dyrektora depends on biura, showing whose office it is

So the structure is:

• do [biura dyrektora]
• into [the director’s office]

You can think of dyrektora as attached to biura, not directly to do.

Yes. Polish often does not use articles like a or the, so context decides.

So bez identyfikatora could mean:

• without an ID
• without the ID
• without an identification badge

In many real-life situations, identyfikator often means a badge, pass, or company ID.

Yes. The sentence as given is completely natural:

• Bez identyfikatora nie mogę wejść do biura dyrektora.

But Polish word order is more flexible than English. You could also hear:

• Nie mogę wejść do biura dyrektora bez identyfikatora.
• Do biura dyrektora nie mogę wejść bez identyfikatora.

These versions all mean roughly the same thing, but the focus changes slightly:

• Bez identyfikatora... puts emphasis on the lack of ID.
• Do biura dyrektora... puts emphasis on the place.
• Nie mogę wejść... gives a more neutral statement first.

Because nie is how Polish negates verbs.

• mogę = I can
• nie mogę = I cannot / I can’t

This is the standard way to make a verb negative:

• mam = I have

• nie mam = I don’t have

• idę = I’m going
• nie idę = I’m not going

With móc, the negative form is very common:

• Nie mogę teraz. = I can’t right now.
• Nie mogę wejść. = I can’t enter.

No, not exactly.

• identyfikator usually means an ID badge, pass, or identification card, especially for work, conferences, or secured buildings.
• dowód osobisty means a national ID card.

So in this sentence, identyfikator most likely means a badge or pass needed to get into the office.

Depending on context, natural translations could be:

• I can't enter the director's office without an ID badge.
• I can't get into the director's office without my ID.
• Without an ID, I can't go into the director's office.

Even if the meaning has already been given, it is useful to know that identyfikator often suggests a workplace badge rather than just any form of identification.

A few useful pronunciation notes:

• bez sounds roughly like bes
• identyfikatora has stress on to: i-den-ty-fi-KA-to-ra
• nie mogę is roughly nye mo-gę
• wejść is tricky; roughly vayshch
• biura is roughly byu-ra
• dyrektora is roughly dy-rek-TO-ra

A key point: Polish stress is usually on the second-to-last syllable:

• identyfiKAtora
• dyrekTOra

Here is a full breakdown:

• Bez → requires genitive

  • identyfikatora = genitive singular

• nie mogę wejść = verb phrase

  • mogę = 1st person singular present
  • wejść = infinitive, perfective

• do → requires genitive

  • biura = genitive singular

• dyrektora = genitive singular, depending on biura

  • meaning of the director

So the sentence contains two clear genitive phrases:

• bez identyfikatora
• do biura dyrektora