Yeni açılan kütüphane okulun yanında bulunuyor.

Açılan is a participle built from açılmak and the suffix -an / -en.

• açılmak = to be opened / to open
• açılan = the one that opens / the one that has been opened

So yeni açılan kütüphane literally means something like:

• the library that has newly opened
• the newly opened library

This is a very common Turkish way to make a noun phrase from a verb.

Because the library is not doing the opening itself in the sense of opening something else. It is the thing that has been opened.

Compare:

• açmak = to open something
• açılmak = to be opened / to open up

So:

• açan adam = the man who opens
• açılan kütüphane = the library that was opened / has opened

In English, newly opened library sounds natural, but in Turkish this idea is usually expressed with the passive-style form açılan.

Not exactly. Yeni means new, but yeni açılan is more specific.

• yeni kütüphane = a new library
  This could mean newly built, newly established, or simply new in general.
• yeni açılan kütüphane = the newly opened library
  This specifically focuses on the fact that it has recently started operating.

So yeni açılan is closer to newly opened than just new.

Because yan means side, and Turkish treats this as a possessed noun in expressions like next to X.

So the structure is:

• okulun = of the school
• yanı = its side
• yanında = at its side / next to it

Literally, okulun yanında is something like:

• at the school’s side

This is why the first noun takes the genitive ending:

• okul → okulun

This pattern is very common:

• evin önünde = in front of the house
• masanın üstünde = on the table
• arabanın arkasında = behind the car

Yanında can be broken down like this:

• yan = side
• -ı / -i / -u / -ü = third-person possessive suffix
• -nda / -nde = locative ending, after the possessive form

So:

• yanı = its side
• yanında = at its side

With okulun yanında, the full structure is:

• okul-un yan-ı-nda

Literally: at the school’s side

This is one of those Turkish expressions that is best learned as a pattern.

Bulunuyor is a verb meaning something like is located, is situated, or sometimes just is found.

So:

• Kütüphane okulun yanında bulunuyor.
  = The library is located next to the school.

If you used var, the sentence would feel less like location of a specific subject and more like there is.

Compare:

• Okulun yanında bir kütüphane var.
  = There is a library next to the school.
• Kütüphane okulun yanında bulunuyor.
  = The library is located next to the school.

So bulunuyor is a good choice when talking about where something is situated, and it can sound a bit more formal or descriptive.

Bulunuyor is in the present continuous form:

• bulun-uyor

In Turkish, the present continuous often covers both:

• is located
• is being located in form, though not in meaning here
• and sometimes a general present meaning in context

With location verbs like this, English usually translates it with a simple present:

• bulunuyor → is located

So even though the form is technically present continuous, the natural English translation is often not progressive.

The basic neutral Turkish word order is often:

• Subject + other elements + verb

Here:

• Yeni açılan kütüphane = subject
• okulun yanında = location
• bulunuyor = verb

So the sentence is very normal and neutral.

Turkish word order is flexible, though. You could move parts around for emphasis:

• Okulun yanında yeni açılan kütüphane bulunuyor.
• Yeni açılan kütüphane bulunuyor okulun yanında.
  This one is much less neutral and more marked.

For learners, the original sentence is a straightforward standard order.

Yes, it can definitely be understood as definite from context.

Turkish has no article system like English a / an / the. So whether something is definite or indefinite depends on context, word order, and structure.

Here, yeni açılan kütüphane is a specific noun phrase, so in English it is very natural to translate it as:

• the newly opened library

Not because Turkish has a word meaning the, but because the whole phrase points to a particular library.

Because it is the subject of the sentence.

In this sentence:

• Yeni açılan kütüphane = the thing being talked about
• okulun yanında = where it is
• bulunuyor = what it does / its state

Subjects in Turkish are usually in the bare form unless some other structure requires something different. So kütüphane does not need accusative, dative, or another case ending here.

That is due to vowel harmony.

The genitive suffix has different forms:

• -ın
• -in
• -un
• -ün

The last vowel in okul is u, so the correct form is:

• okul + un = okulun

Some examples:

• ev → evin
• kapı → kapının
• okul → okulun
• gül → gülün

So okulun yanında follows normal vowel harmony rules.

Yes, but it is not exactly the same.

• yeni açılan kütüphane = the newly opening / newly opened library as a descriptive modifier
• yeni açılmış kütüphane = the library that has recently been opened

Both can be natural depending on context, but açılan is very common in noun-modifying phrases of this kind.

Very roughly:

• -an / -en participle often feels like a more direct adjectival modifier
• -mış form often highlights a completed result or reported/past state

In many everyday situations, both may be understandable, but yeni açılan kütüphane is a very standard way to say the newly opened library.