Türkçede “-mişken” yapısına bir örnek daha verelim: “Bilgisayarı açmışken dosya ekini de gönder.”

In this sentence, -mişken gives the sense of since you’ve already done X / while you’re at it / now that X has happened.

So Bilgisayarı açmışken dosya ekini de gönder means something like:

• Since you’ve opened the computer, send the attachment too.
• While you’re at it, send the attachment too.

It often suggests that one action is a convenient opportunity for another action.

Açmışken can be broken down like this:

• aç- = open
• -mış = a past/resultative marker
• -ken = while / when

Together, açmışken literally looks like while having opened or when already opened, but in natural English it usually becomes since you’ve opened it or while you’re at it.

Because of vowel harmony, this suffix can appear in different forms:

• -mışken
• -mişken
• -muşken
• -müşken

For example:

• gelmişken = since you’ve come / while you’re here
• gitmişken = since you’ve gone / while you had gone

These two forms are similar but not the same.

• açarken = while opening
• açmışken = since you’ve opened / now that you’ve opened / while you’re at it

So:

• Bilgisayarı açarken... would focus on the action in progress: while opening the computer
• Bilgisayarı açmışken... focuses on the fact that the opening has already been done, and now that situation creates a good moment for something else

That is why -mişken fits better here.

The -ı here is the accusative ending, marking a definite direct object.

• bilgisayar = computer
• bilgisayarı = the computer / the computer as the object of the verb

In Bilgisayarı açmışken, the idea is having opened the computer or since you’ve opened the computer, so computer is the object of open.

This is normal in Turkish when the object is specific or definite.

Compare:

• Bilgisayar açmak = to open/start a computer (more general)
• Bilgisayarı açmak = to open/start the computer (a specific one)

Dosya eki means file attachment or simply attachment.

Breakdown:

• dosya = file
• ek = addition, attachment
• dosya eki = file attachment
• dosya ekini = the file attachment (as a definite direct object)

The -ni at the end includes the accusative marking because it is the object of gönder.

So:

• dosya eki gönder = send a file attachment
• dosya ekini gönder = send the file attachment

In modern usage, people also often say eki gönder if the context is already clear.

De here means also / too.

So dosya ekini de gönder means:

• send the attachment too
• also send the attachment

It adds the idea that this is one more action to do in addition to something else.

This fits very naturally with -mişken, because the whole sentence has a while you’re at it feeling:

• Since you’ve opened the computer, send the attachment too.

Gönder is the informal singular imperative of göndermek (to send).

So it means:

• send!

In Turkish, imperative forms often do not need an explicit subject. The subject you is understood.

So:

• gönder = send (it)

If you wanted a more polite version, you could say:

• gönderin = send (formal/plural)

So the original sentence is directed at one person in a relatively direct, everyday way.

It is quite idiomatic. Turkish uses -mişken very naturally in this kind of since you’ve already... / while you’re at it... situation.

Common similar examples are:

• Markete gitmişken ekmek de al.
  Since you’re going to / have gone to the store, buy bread too.

• Buraya gelmişken seni de göreyim dedim.
  Since I was here / while I was here, I thought I’d see you too.

• Bilgisayarı açmışken maillere de bak.
  Since you’ve opened the computer, check the emails too.

So yes, this is a normal and useful pattern.

Yes, Turkish word order is flexible, but each order sounds slightly different in emphasis.

The original:

• Bilgisayarı açmışken dosya ekini de gönder.

This sounds natural and balanced.

You could also say:

• Dosya ekini de bilgisayarı açmışken gönder.

This is understandable, but it sounds more marked and puts stronger focus on dosya ekini de.

In everyday Turkish, the original order is probably the most natural. Turkish often places background information first and the main instruction later, which is exactly what happens here:

1. Bilgisayarı açmışken = background circumstance
2. dosya ekini de gönder = main action

Not exactly. It comes from the -miş form, which often has a past or completed sense, but with -mişken the important idea is usually the situation already being in place.

So it often means things like:

• since you’ve already...
• now that...
• while you’re at it...

It is not always just a simple past translation.

For example:

• Hazır gelmişken, bir kahve içelim.
  Since you’re here already, let’s have a coffee.

This is less about past time and more about taking advantage of the current situation.

It means:

• Let’s give one more example of the -mişken structure in Turkish.

Breakdown:

• Türkçede = in Turkish
• -mişken yapısına = to the -mişken structure / of the -mişken construction
• bir örnek daha = one more example
• verelim = let’s give

A few grammar notes:

• verelim is the first person plural imperative / hortative: let’s give
• daha means more, so bir örnek daha = one more example
• yapı means structure, construction, form
• yapısına contains the dative ending because örnek vermek often takes the thing being exemplified in this kind of phrasing

So this first part is just the textbook-style introduction to the example sentence that follows.