Tebrikler, proje tamamlandı.

Because Turkish commonly uses the plural form tebrikler as a fixed expression meaning congratulations.

It comes from tebrik = congratulation / praise, and the plural -ler makes it into the standard idiomatic form. English does something similar with congratulations, which is also plural.

So learners should usually treat tebrikler as one whole expression, not as a literal countable plural they need to analyze every time.

Tamamlandı means was completed or has been completed, depending on context.

In this sentence, English might naturally translate it as either:

• The project was completed.
• The project has been completed.

Turkish -dı/-di is the simple past, but in English the best translation can sometimes sound like a present perfect if the result matters now.

This is a very common question.

• tamamladı = he/she/it completed (something)
• tamamlandı = it was completed / it got completed

So:

• Ali projeyi tamamladı = Ali completed the project
• Proje tamamlandı = The project was completed

The form tamamlandı comes from the verb tamamlanmak, which is the passive/intransitive counterpart of tamamlamak.

In this sentence, the focus is on the project reaching completion, not on who did it.

It is in the simple past.

You can break it down roughly like this:

• tamamlan- = be completed / become complete
• -dı = past tense

Because of Turkish sound rules, the ending appears here as -dı.

So grammatically it is past tense, even though English may sometimes translate it as has been completed.

Turkish does not have a definite article like English the.

So proje can mean:

• project
• the project

Which one is intended depends on context.

In Tebrikler, proje tamamlandı, the natural meaning is the project, because both speaker and listener already know which project is being discussed.

Because Turkish often leaves the agent unstated when it is unknown, unimportant, or obvious from context.

Proje tamamlandı focuses on the result: the project is finished.

If you wanted to say who did it, you would usually switch to an active sentence, for example:

• Ekibimiz projeyi tamamladı. = Our team completed the project.
• Biz projeyi tamamladık. = We completed the project.

So the original sentence is natural because the important message is simply that the project is done.

No, Turkish word order is flexible, though some versions sound more natural in certain contexts.

Tebrikler, proje tamamlandı is natural and clear. It sounds a bit like an announcement or notification.

Other possible orders include:

• Proje tamamlandı, tebrikler.
• Proje tamamlandı. Tebrikler!

These all work, but the emphasis shifts slightly.

• Starting with Tebrikler foregrounds the emotional reaction.
• Starting with Proje tamamlandı foregrounds the factual news.

Yes, but they are not exactly the same in tone.

• Tebrikler = Congratulations!
  This is the most common short standalone expression.
• Tebrik ederim = I congratulate you / I offer my congratulations
  This sounds a little more formal or complete.

So in a short message like this, Tebrikler is the most natural choice.

Yes, it is understandable and natural, especially in a message, notification, or announcement.

That said, depending on tone, Turkish speakers might also write:

• Tebrikler! Proje tamamlandı.
• Proje tamamlandı, tebrikler!

Using an exclamation mark after Tebrikler can make it sound more lively and emotional. With a comma, it can sound a little more like a compact written announcement.

A rough pronunciation guide is:

• Tebrikler → teb-rik-ler
• proje → pro-je
• tamamlandı → ta-mam-lan-duh

A few helpful notes:

• Turkish r is lightly rolled or tapped.
• j in proje sounds like the s in measure.
• The final ı in -dı is the Turkish ı, a vowel that does not exist in English. It is not the same as English ee.

So the whole sentence is approximately:

teb-rik-ler, pro-je ta-mam-lan-duh

Both can often be translated as finished, but they are not always identical.

• bitti = ended / finished
• tamamlandı = was completed

For a project, tamamlandı often sounds a bit more formal or official, and it emphasizes successful completion.

Examples:

• Film bitti. = The movie ended.
• Proje tamamlandı. = The project was completed.

You may hear Proje bitti in casual speech, but Proje tamamlandı is especially common in formal, professional, or status-update contexts.