Kostümler hazır olduğu sürece koreografiyi bugün deneyebiliriz.

-DIği sürece is a common Turkish pattern meaning as long as, so long as, or provided that.

So here:

• hazır olduğu sürece = as long as it/they are ready

It comes from olmak (to be) and is best learned as a chunk:

• X olduğu sürece = as long as X is

This is a very common question. In Turkish, third-person forms inside this kind of subordinate structure are often left in a singular-looking form, especially when the subject is an inanimate plural noun like kostümler (costumes).

So kostümler hazır olduğu sürece is natural and correct.

You may sometimes also see fuller plural agreement in other contexts, but the version in this sentence is completely normal.

Turkish does not need a separate word like English their here. The structure itself already links the idea together.

So:

• kostümler hazır olduğu sürece = as long as the costumes are ready

Even though English uses a separate possessive-like idea in explanations, Turkish usually just builds it into the clause pattern.

The -yi is the accusative case, used for a specific, definite direct object.

Here, koreografi means choreography, and koreografiyi means the choreography / this specific choreography.

Why -yi and not just -i?

Because the noun ends in a vowel, Turkish inserts a buffer consonant y:

• koreografi
• koreografi + y + i
• koreografiyi

So the ending marks the object as specific.

deneyebiliriz can be broken down like this:

• dene- = try
• -yebil- = can / be able to
• -ir = aorist marker
• -iz = we

So:

• deneyebiliriz = we can try

The y is a buffer consonant.

Here denemek means something like:

• to try
• to try out
• to test

With koreografi, it suggests trying the choreography in practice and seeing how it goes.

If you wanted a stronger sense of rehearse, Turkish might also use expressions like prova yapmak or çalışmak, but denemek sounds natural here.

Yes, you could.

The difference is mostly nuance:

• hazırsa = if they are ready
• hazır olduğu sürece = as long as / provided that they are ready

So hazırsa is a simpler if-condition, while olduğu sürece emphasizes that the condition holds.

The subject is we, and it is already included in the verb ending -iz.

So Turkish does not need a separate pronoun:

• deneyebiliriz = we can try

You could add biz for emphasis, but normally it is omitted.

Yes, Turkish word order is flexible. The verb usually stays at the end, but other parts can move depending on emphasis.

These are all possible:

• Bugün koreografiyi deneyebiliriz.
• Koreografiyi bugün deneyebiliriz.
• Kostümler hazır olduğu sürece koreografiyi bugün deneyebiliriz.

The version you have is natural. Putting bugün before the verb is very common.

Turkish does not have articles like English the and a/an.

Instead, definiteness is often shown by:

• context
• word order
• case marking

In this sentence, koreografiyi has accusative marking, which strongly suggests a specific choreography, so English often translates it as the choreography.