Το σκηνικό είναι έτοιμο για τη γενική πρόβα.

Here το σκηνικό means the set or the stage setting—the physical setup prepared for a performance.

Depending on context, σκηνικό can also mean:

• scenery
• setting
• even scene/background in a more general sense

But with πρόβα (rehearsal), the most natural meaning is the set.

Greek often uses different words where English might use one broader word.

• η σκηνή usually means the stage or the scene
• το σκηνικό usually means the set / the scenery / the stage setup

So if the idea is that the physical production setup is ready, το σκηνικό is the right choice.

Because it agrees with το σκηνικό, which is:

• singular
• neuter

The adjective έτοιμος (ready) changes form to match the noun:

• έτοιμος = masculine
• έτοιμη = feminine
• έτοιμο = neuter

So:

• ο ηθοποιός είναι έτοιμος = the actor is ready
• η ηθοποιός είναι έτοιμη = the actress is ready
• το σκηνικό είναι έτοιμο = the set is ready

Είναι means is and comes from the verb είμαι (to be).

So the structure is very similar to English:

• Το σκηνικό = the set
• είναι = is
• έτοιμο = ready

Together: The set is ready.

Greek does use this verb normally in sentences like this, so there is nothing unusual about είναι here.

Here για means for.

So:

• έτοιμο για... = ready for...

Examples:

• Είμαι έτοιμος για το μάθημα. = I’m ready for the lesson.
• Είναι έτοιμη για το ταξίδι. = She is ready for the trip.

In your sentence:

• για τη γενική πρόβα = for the dress rehearsal / for the final rehearsal

After για, Greek uses the accusative case.

So both the article and the adjective+noun phrase are in the accusative:

• nominative: η γενική πρόβα
• accusative: τη(ν) γενική πρόβα

This is why you see:

• για τη γενική πρόβα

The adjective γενική stays feminine singular here because it matches πρόβα, which is feminine singular.

Τη is a shortened form of την.

In modern Greek, the final -ν in words like την is often dropped before many consonants in everyday writing and speech. Since γενική starts with γ, you will very often see:

• τη γενική πρόβα

You may also see:

• την γενική πρόβα

Both are understandable, but τη γενική πρόβα is very common and natural.

Literally, it means general rehearsal, but in natural English it usually corresponds to dress rehearsal or final rehearsal before the performance.

So this is a set phrase in Greek:

• γενική πρόβα = the last full rehearsal, often under performance conditions

It does not usually mean just any rehearsal.

In Greek, adjectives commonly come before the noun, especially in straightforward descriptive phrases.

So:

• η γενική πρόβα = the dress rehearsal

This word order is the normal one here. Greek can sometimes place adjectives after the noun, but that usually changes the style, emphasis, or nuance.

Yes, Greek word order is more flexible than English, but the original sentence is the most neutral and natural:

• Το σκηνικό είναι έτοιμο για τη γενική πρόβα.

You might change the order for emphasis, for example:

• Για τη γενική πρόβα, το σκηνικό είναι έτοιμο.

That would put extra focus on for the dress rehearsal. But for a simple statement, the original order is best.

A simple pronunciation guide is:

To skinikó íne étimo ya ti yenikí próva.

A few helpful points:

• σκ in σκηνικό sounds like sk
• για sounds like ya
• γ before ε in γενική sounds like a soft y-like sound to English ears
• The stressed syllables are:
  • σκηνικό
  • είναι
  • έτοιμο
  • γενική
  • πρόβα

Yes, very common. This is a useful pattern:

• είμαι / είναι + έτοιμος, έτοιμη, έτοιμο + για + accusative

Examples:

• Είμαι έτοιμος για δουλειά. = I’m ready for work.
• Είναι έτοιμη για εξετάσεις. = She is ready for exams.
• Το φαγητό είναι έτοιμο για σερβίρισμα. = The food is ready for serving.

So your sentence is a great model to learn from.