Κάθομαι στο σκαμπό της κουζίνας και βάζω το φαγητό μου σε τάπερ για αύριο.

Greek often leaves out subject pronouns when they are already clear from the verb ending.

Here, κάθομαι and βάζω are both first person singular, so the subject is understood as I.

• κάθομαι = I sit / I am sitting
• βάζω = I put / I am putting

You could say Εγώ κάθομαι... if you want emphasis, but normally Greek does not need the pronoun.

It can mean either, depending on context.

Greek present tense often covers both:

• I sit
• I am sitting

In this sentence, it most naturally sounds like an action happening now: I’m sitting on the kitchen stool and putting my food into a container for tomorrow.

So Greek does not need a separate progressive form like English am sitting.

That is a very common learner question.

The ending -μαι is associated with the middle/passive set of verb endings, but not every verb with those endings is truly passive in meaning. Κάθομαι is one of those verbs.

So:

• κάθομαι = I sit / I am sitting
• it is not passive here
• this is simply the normal dictionary form of the verb

Greek has quite a few verbs like this, where the form looks middle/passive but the meaning is active or everyday/non-passive.

Στο is a contraction of:

• σε
  • το → στο

So στο σκαμπό literally means something like:

• on the stool
• at the stool
• in the stool would not make sense in English, but Greek σε is broader than any one English preposition

In this sentence, English uses on: on the stool.

This is very common in Greek:

• στο σπίτι = in/at the house
• στο τραπέζι = on the table
• στον φίλο μου = to my friend

Της κουζίνας is the genitive form of η κουζίνα and means of the kitchen.

So:

• το σκαμπό της κουζίνας = literally the stool of the kitchen
• in natural English: the kitchen stool or the stool in the kitchen, depending on context

Greek often uses the genitive where English uses:

• of
• a noun used like an adjective, as in kitchen stool
• sometimes a relationship that English expresses more loosely

So της κουζίνας tells you which stool it is.

Because after της, the noun is in the genitive singular.

Compare:

• η κουζίνα = the kitchen
• της κουζίνας = of the kitchen

This is a basic case change in Greek. The article changes too:

• nominative: η
• genitive: της

So the phrase is showing possession/association: the stool of the kitchen.

In normal Greek, possessive words like μου, σου, του, της usually come after the noun.

So:

• το φαγητό μου = my food
• το σπίτι μου = my house
• η αδερφή μου = my sister

This is the most standard pattern.

Putting μου somewhere else can happen in special cases, but it is not the neutral/basic way to say my food.

Because σε τάπερ is being used in a more indefinite/general way: into a container / into Tupperware.

Compare:

• σε τάπερ = into Tupperware / into a food container
• σε ένα τάπερ = into a container
• στο τάπερ = into the container

So the sentence does not focus on a particular named container. It just says the food is being put into a plastic food container / Tupperware.

Τάπερ is a very common Greek word for a plastic food container, especially the kind used to store leftovers or take food with you.

It comes from Tupperware, but in everyday Greek it is often used as a general noun, not just for the brand.

So here:

• σε τάπερ = into a food container / into Tupperware

This is extremely natural everyday Greek.

Here για αύριο means for tomorrow.

In other words, the speaker is putting the food away so it can be eaten or used tomorrow.

• για = for
• αύριο = tomorrow

So the sense is:

• I’m putting my food in a container for tomorrow

It does not mean until tomorrow. If you wanted until tomorrow, Greek would more naturally use μέχρι αύριο.

Also, αύριο does not need an article here. Time words like today, tomorrow, yesterday often appear without one.

A quick breakdown:

• στο σκαμπό: σκαμπό is after σε, so it is functioning as accusative
• της κουζίνας: κουζίνας is genitive
• το φαγητό μου: φαγητό is the direct object, so it is accusative
• σε τάπερ: τάπερ is again after σε, so it is accusative

One thing that can be confusing is that many neuter nouns look the same in nominative and accusative. So even though the case is accusative, the form may not visibly change.

That is why:

• το σκαμπό
• το φαγητό
• το τάπερ

all look very similar to their dictionary forms.

Yes. Greek word order is more flexible than English because the endings and articles already show grammatical relationships.

The given sentence is a very natural, neutral order:

• Κάθομαι στο σκαμπό της κουζίνας και βάζω το φαγητό μου σε τάπερ για αύριο.

But Greek could move parts around for emphasis, for example:

• Το φαγητό μου το βάζω σε τάπερ για αύριο.
• Στο σκαμπό της κουζίνας κάθομαι και βάζω το φαγητό μου σε τάπερ για αύριο.

Those versions shift emphasis, but the original is straightforward and natural for ordinary narration.