Oyun yazarı ve dramaturg sahne yönergesini düzeltti ve mimiği tartıştı.

This is a very common Turkish noun-compound pattern.

• oyun = play
• yazar = writer
• oyun yazarı = playwright

In Turkish, compounds like this usually work as noun + noun, and the second noun takes a special ending, often called the compound marker or 3rd person possessive form.

So:

• yazar → yazarı
• oyun yazarı = play writer / playwright

This does not necessarily mean literal possession in English. It is just the normal way Turkish builds many compounds, like:

• çocuk kitabı = children’s book
• okul müdürü = school principal

Because it contains several pieces stacked together:

• sahne = stage
• yönerge = direction / instruction
• yönergesi = stage direction (compound form)
• yönergesini = the stage direction, as a definite direct object

A useful breakdown is:

• sahne
• yönerge
• -si = compound/possessive ending
• -ni = accusative ending

So sahne yönergesini means the object being corrected is a specific stage direction.

The -n- in -ni is a buffer consonant that appears after that possessive ending.

Because it takes the accusative case and also undergoes a sound change.

• dictionary form: mimik
• accusative: mimiği

What happens?

1. The direct object is specific/definite, so it takes the accusative ending.
2. Final k often softens to ğ when a vowel-initial ending is added.

So:

• mimik
  • -i → mimiği

This kind of change is very common in Turkish:

• kitap → kitabı
• renk → rengi
• mimik → mimiği

Yes. Both sahne yönergesini and mimiği are direct objects, and both are marked as definite/specific.

In Turkish, a direct object often takes the accusative ending when it refers to something specific.

So here:

• sahne yönergesini düzeltti = corrected the specific stage direction
• mimiği tartıştı = discussed the specific facial expression / mimic

If the object were indefinite or non-specific, Turkish often leaves it without that accusative ending.

Because in Turkish, when the subject is explicitly stated, a 3rd person singular verb is often perfectly natural, even with more than one person.

So Turkish can say something like:

• Ali ve Ayşe geldi
• Ali ve Ayşe geldiler

Both can be acceptable, depending on style, emphasis, and context.

In your sentence, düzeltti and tartıştı are singular past forms, and that is normal Turkish usage.

Grammatically, it can be ambiguous without context.

It could mean:

• one person who is both a playwright and a dramaturg
• two people: the playwright and the dramaturg

The singular verb does not completely settle the question, because Turkish often uses singular verb forms even when the subject includes more than one person.

So the real answer is: context tells you.

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

Instead, Turkish expresses those ideas in other ways, such as:

• context
• word order
• case endings
• whether the object has the accusative ending

In this sentence, the accusative on sahne yönergesini and mimiği helps show that these are specific things, which often corresponds to English the.

Because Turkish normally prefers Subject + Object + Verb order.

So instead of English-style:

• subject + verb + object

Turkish often uses:

• subject + object + verb

In this sentence, each action follows that pattern:

• Oyun yazarı ve dramaturg sahne yönergesini düzeltti
• ve mimiği tartıştı

The second part leaves out the repeated subject because it is already understood.

They are both in the simple past tense.

Breakdown:

• düzelt-ti = corrected
• tartış-tı = discussed

The past tense suffix is often shown as -DI, but its actual form changes because of vowel harmony and consonant rules.

That is why you get forms like:

• -dı
• -di
• -du
• -dü
• -tı
• -ti
• -tu
• -tü

Here:

• düzelt- ends in a voiceless consonant, so the suffix appears as -ti
• tartış- also ends in a voiceless consonant, so the suffix appears as -tı

Because Turkish commonly states the subject once and then continues with more verbs connected by ve.

So the structure is:

• [subject] [object] corrected
• and [object] discussed

The understood subject of both verbs is still oyun yazarı ve dramaturg.

This is very natural in Turkish and works much like English when we say:

• The playwright and dramaturg corrected the stage direction and discussed the mimic.