Ta filia nadal istnieje.

Ta is the feminine singular nominative form of this.

Polish this changes depending on the gender of the noun:

• ten = masculine
• ta = feminine
• to = neuter

Because filia is a feminine noun, you use ta filia.

Filia is feminine.

A very common clue in Polish is that nouns ending in -a are often feminine. That is not true in every single case, but it is a very strong pattern.

So:

• filia → feminine
• therefore: ta filia
• and the verb agrees in number, not gender here, so you get istnieje because the subject is singular

Filia usually means a branch, branch office, subsidiary location, or local branch of some institution or company.

It is not the everyday Polish word for every kind of branch. Depending on context, Polish might also use words like:

• oddział = branch, department, division
• placówka = facility, branch location
• filia = especially a branch office or local branch of a larger organization

So filia is a real, common Polish word, but it is more institutional than a literal tree branch.

It is related in form to English filial, but the meanings are not the same in everyday use.

Yes, nadal often means still or continues to.

In this sentence, it shows that the branch continues to exist. It suggests that maybe someone thought it had closed, disappeared, or stopped operating, but it has not.

A close English sense is:

• still
• still exists
• continues to exist

A similar Polish word is wciąż, which also often means still. In many contexts, nadal and wciąż are very close.

Istnieje is the 3rd person singular present tense of istnieć, which means to exist.

Since the subject is singular:

• ta filia = this branch
• istnieje = exists

So the structure is:

• subject + adverb + verb
• Ta filia nadal istnieje.

This verb is used when something exists, continues to exist, or is real / present as an entity.

Because być (jest) and istnieć (istnieje) are not the same.

• jest = is
• istnieje = exists

Compare:

• Ta filia jest duża. = This branch is big.
• Ta filia istnieje. = This branch exists.

English sometimes uses is where Polish prefers exists, but here istnieje is more precise if you want to say that the branch has not ceased to exist.

Polish does not need a dummy subject like English there.

English often says:

• There is a branch.
• There exists a branch.

Polish can simply say:

• Filia istnieje.

So Polish states the subject directly, without adding a filler word like there.

Yes. Polish word order is more flexible than English, although the basic version here is very natural:

• Ta filia nadal istnieje.

Other possible orders include:

• Ta filia istnieje nadal.
• Nadal ta filia istnieje.
• Nadal istnieje ta filia.

These can sound slightly different in emphasis. For example:

• Ta filia nadal istnieje. = neutral, standard
• Ta filia istnieje nadal. = slightly more emphasis on still
• Nadal istnieje ta filia. = stronger focus on the fact of continued existence

For a learner, the original sentence is the safest and most natural choice.

It is in the nominative case because it is the subject of the sentence.

The basic dictionary form is:

• filia = nominative singular

In this sentence:

• Ta filia = the subject
• so nominative is required

If the noun had another role in the sentence, the case could change. For example:

• Nie ma tej filii. = There is no such branch.
  Here filii is genitive.

But in Ta filia nadal istnieje, nominative is correct.

A simple learner-friendly guide:

• filia ≈ fee-LYAH
• istnieje ≈ ees-TNYE-ye

A few useful notes:

• Polish stress is usually on the second-to-last syllable
• so:
  • fi-LI-a
  • is-TNIE-je

The tricky part is istnieje, especially tn / nie / je together. Try saying it slowly first:

• is-tnie-je

Then speed it up.

Yes, very much so.

Nadal istnieje is a natural and common way to say that something still exists or continues to exist.

You can use it with many kinds of subjects:

• Ten problem nadal istnieje. = This problem still exists.
• Ta tradycja nadal istnieje. = This tradition still exists.
• To zagrożenie nadal istnieje. = This danger still exists.

So this sentence uses a very normal Polish pattern.

Yes. Filia can be used for the branch of many kinds of institutions, for example:

• a library branch
• a university branch
• a company branch
• another local branch of a larger institution

The exact English translation depends on context, but the Polish sentence structure stays the same:

• Ta filia nadal istnieje.

So the grammar here is general, even if the real-world meaning of filia changes slightly with context.