Bu oyunu gelecek ay sahneleyeceğiz.

Because oyunu is the definite direct object of the sentence.

• oyun = play / game
• oyunu = the play / this play as the object

In Turkish, if the direct object is specific or definite, it usually takes the accusative suffix.

Here, bu already makes it specific: this play, so Turkish uses the accusative:

• bu oyun = this play
• bu oyunu = this play (as the object of the verb)

Since oyun ends in a consonant, the suffix appears directly as -u.

sahneleyeceğiz means we will stage / we will perform.

It breaks down like this:

• sahnele- = to stage, to put on stage
• -(y)ecek = future tense suffix
• -iz = we

So:

• sahnele- + yecek + iz → sahneleyeceğiz

The y appears because the verb stem ends in a vowel, and Turkish often inserts a buffer y between two vowels.

This happens because of the personal ending.

The future tense is:

• -ecek or -acak

But when you add a personal ending that begins with a vowel, the final k often softens to ğ in standard spelling:

• gelecek + iz → geleceğiz
• sahneleyecek + iz → sahneleyeceğiz

So the change is normal and very common in Turkish verb conjugation.

Because Turkish usually doesn’t need subject pronouns unless they are being emphasized.

The ending -iz in sahneleyeceğiz already tells you the subject is we.

So:

• Bu oyunu gelecek ay sahneleyeceğiz. = We will stage this play next month.

You could also say:

• Biz bu oyunu gelecek ay sahneleyeceğiz.

But biz would add emphasis, like we in contrast to someone else.

Literally, gelecek comes from gelmek = to come, so gelecek ay is literally the coming month.

This is a very natural Turkish way to say next month.

So:

• gelecek ay = next month
• literally: the coming month

This works like English expressions such as the coming week or the coming year.

Yes, but the nuance is a little different.

• gelecek ay = next month
• önümüzdeki ay = next month
• sonraki ay = the following month / the next one after that contextually

In many situations, gelecek ay is the most natural everyday choice for next month.

sonraki ay can work, but it often sounds more like the month after the current one in sequence, depending on context.

Because Turkish often uses time expressions without a case ending when they answer when?

Examples:

• bugün = today
• yarın = tomorrow
• gelecek ay = next month
• geçen hafta = last week

So in this sentence, gelecek ay simply means next month as a time expression, and no extra ending is needed.

No, Turkish word order is flexible, but the verb usually comes at the end.

This sentence has:

• Bu oyunu = object
• gelecek ay = time expression
• sahneleyeceğiz = verb

That order is very natural. But you could also say:

• Gelecek ay bu oyunu sahneleyeceğiz.

This is also correct. The difference is mostly about focus or emphasis, not basic meaning.

By itself, oyun can mean either game or play.

But the verb sahnelemek makes the meaning clear here. You stage or perform a theatrical work, so in this sentence oyun means play.

So context tells you which meaning is intended.

Yes, but the meaning would change.

• bu oyunu = this specific play
• bir oyun = a play, some play

Compare:

• Bu oyunu gelecek ay sahneleyeceğiz. = We will stage this play next month.
• Gelecek ay bir oyun sahneleyeceğiz. = We will stage a play next month.

Notice that bir oyun does not take the accusative here, because it is indefinite.

Sahnelemek is a transitive verb, meaning it normally takes an object.

It means things like:

• to stage
• to put on
• to perform on stage

So it fits naturally with an object like bu oyunu.

That is why the structure is:

• [object] + [time] + [verb]
• Bu oyunu gelecek ay sahneleyeceğiz.