Telefonu masaya koyar koymaz bildirim geldi.

Because telefonu has the accusative ending and marks the phone as a specific, definite object.

• telefon = a phone / phone in a general sense
• telefonu = the phone / that phone

With koymak (to put/place), if you are placing a specific thing, Turkish usually marks it with the accusative:

• Telefonu masaya koydum. = I put the phone on the table.
• Bir telefon masaya koydum. = I put a phone on the table.

So in this sentence, the speaker is talking about a particular phone, not just any phone.

Masaya is masa + -ya, the dative case, which often means to, onto, or toward.

Here it shows the destination of the action:

• masa = table
• masaya = to/onto the table

With koymak, Turkish commonly uses the dative for the place where something is put:

• Kitabı masaya koydum. = I put the book on the table.
• Anahtarı çantaya koydu. = She put the key into the bag.

So telefonu masaya koymak means to put the phone on the table.

-Ar/-Ir ... -maz/-mez in this pattern means as soon as ..., the moment ..., or no sooner had ... than ...

So:

• koyar koymaz = as soon as (someone) put it down

This is a fixed Turkish time expression built from the verb stem:

• koy-ar koy-maz

Even though it looks like two forms of the same verb, together they function like a conjunction of time: as soon as.

Other examples:

• Eve varır varmaz beni ara. = Call me as soon as you arrive home.
• Kapıyı açar açmaz köpek dışarı çıktı. = As soon as he opened the door, the dog ran outside.
• Onu görür görmez tanıdım. = I recognized him as soon as I saw him.

Because this special structure uses the aorist form of the verb plus the negative aorist form:

• koyar koymaz
• gelir gelmez
• biter bitmez
• duyar duymaz

It does not use the simple past in the first part.

This is just how the Turkish pattern is formed. Even though the whole event happened in the past, the time relationship is shown by koyar koymaz, while the tense of the main sentence is shown separately:

• Telefonu masaya koyar koymaz bildirim geldi.

So:

• koyar koymaz = as soon as putting/putting it down
• geldi = the notification came

The actual past meaning for the full sentence comes mainly from geldi.

Turkish often omits the subject when it is understood from context.

In this sentence, there is no explicit subject like I, he, she, or they. So depending on context, it could mean:

• As soon as I put the phone on the table...
• As soon as he/she put the phone on the table...
• As soon as someone put the phone on the table...

This is very normal in Turkish. Pronouns are often dropped unless they are needed for emphasis or clarity.

If you wanted to make it explicit, you could say:

• Telefonu masaya koyar koymaz bildirim geldi. = As soon as I/he/she put the phone on the table, a notification arrived.
• Telefonu masaya koyar koymaz bana bildirim geldi. = As soon as I put the phone on the table, I got a notification.
  (Depending on context, this can make the person involved clearer.)

Turkish usually follows Subject–Object–Verb order, and the main verb often comes last.

Here:

• Telefonu masaya koyar koymaz = as soon as (someone) put the phone on the table
• bildirim geldi = a notification came

So the main finite verb geldi naturally appears at the end.

That said, Turkish word order is flexible. You can move things around for emphasis, but the neutral version usually keeps the verb at the end.

Both are possible, but they are slightly different in nuance.

• bildirim geldi = a notification came / a notification arrived
• bir bildirim geldi = a notification came, with bir making the indefiniteness more explicit

In Turkish, bare nouns can sometimes be used where English would say a/an. So bildirim geldi is perfectly natural.

Compare:

• Mesaj geldi. = A message came.
• Telefon çaldı. = The phone rang.
• Misafir geldi. = A guest came / guests came, depending on context.

Adding bir can make it sound a little more explicitly like one/a certain notification, but it is not required.

Yes, that captures the timing well, but be careful: the Turkish sentence does not explicitly use a passive form.

• Telefonu masaya koyar koymaz literally suggests that someone put the phone on the table
• the phone was put on the table is passive in English

English sometimes uses passive wording naturally, but grammatically the Turkish is based on an active verb: koymak (to put), not konmak or koyulmak in a passive sense.

So a more direct translation would be:

• As soon as I/he/she put the phone on the table, a notification came.

But your version may still sound natural in English if the person doing the action is unimportant.

It can be used with many verbs, especially when you want to express immediate sequence: one thing happens right after another.

Examples:

• Görür görmez = as soon as he/she saw
• Duyar duymaz = as soon as he/she heard
• Biter bitmez = as soon as it finished
• Başlar başlamaz = as soon as it started
• Oturur oturmaz = as soon as he/she sat down

However, in real usage it works best with verbs that make sense in a clear, immediate timeline. It is very common and productive, but some verbs sound more natural in this pattern than others.

Geldi is very natural because Turkish often says notifications, messages, calls, and emails come.

Examples:

• Mesaj geldi. = A message came.
• Bildirim geldi. = A notification came.
• E-posta geldi. = An email came.

This is similar to English, where we also say a message came in or I got a notification.

Other verbs are possible in different contexts:

• Bildirim düştü can also be heard in colloquial Turkish, especially in tech-related speech, roughly like a notification dropped/popped up
• Bildirim göründü = the notification appeared

But bildirim geldi is standard and very common.

Yes, you could say that, but the nuance is a little different.

• Telefonu masaya koyunca bildirim geldi. = When/after I put the phone on the table, a notification came.
• Telefonu masaya koyar koymaz bildirim geldi. = As soon as I put the phone on the table, a notification came.

So koyar koymaz is stronger and more immediate. It emphasizes that the second action happened almost instantly after the first.

If you want the sense of the very moment or immediately after, koyar koymaz is the better choice.

A rough pronunciation guide:

• koyar ≈ ko-YAR
• koymaz ≈ koy-MAZ

The y is pronounced like English y in yes.

So:

• ko-YAR koy-MAZ

And the full sentence:

• Telefonu masaya koyar koymaz bildirim geldi.

A rough stress guide:

• telefonu
• masaya
• koyar koymaz
• bildirim geldi

In natural speech, koyar koymaz is often said smoothly as one chunk because it functions as a set time expression.