Επαναχρησιμοποιώ το κουτί.

A rough pronunciation is:

eh-pa-na-hree-see-mo-po-O to koo-TEE

A few useful notes:

• The stress is on the last syllable of επαναχρησιμοποιώ and κουτί.
• χ is not like English ch in church. It is a rough sound, like the ch in German Bach or Scottish loch.
• ου sounds like oo in food.

So the rhythm is roughly:

e-pa-na-hri-si-mo-pi-O to ku-TI

Because Greek very often builds new meanings by adding prefixes to verbs.

Here:

• χρησιμοποιώ = I use
• επανα- = again / re-
• επαναχρησιμοποιώ = I reuse

So this is a very literal Greek way of saying use again.

You may also hear:

• ξαναχρησιμοποιώ
• χρησιμοποιώ ξανά

These also mean I use again / I reuse.
Επαναχρησιμοποιώ is perfectly correct and can sound a bit more formal or technical.

Greek often leaves out subject pronouns when they are not needed.

The ending of the verb already tells you the subject:

• επαναχρησιμοποιώ = I reuse

So εγώ is usually unnecessary.

You could say:

• Εγώ επαναχρησιμοποιώ το κουτί.

But that adds emphasis, as if you mean:

• I reuse the box
• I am the one reusing the box

In normal speech, the pronoun is usually omitted.

It is present tense.

Depending on context, it can mean:

• I reuse the box
• I am reusing the box
• I do reuse the box

Greek present tense often covers both simple present and present continuous ideas that English separates.

It also has imperfective aspect, which means it presents the action as ongoing, repeated, or general rather than as a single completed whole.

Because χρησιμοποιώ belongs to a common Greek verb pattern often called the -ώ type.

So its present-tense forms are like:

• χρησιμοποιώ = I use
• χρησιμοποιείς = you use
• χρησιμοποιεί = he/she/it uses

When you add the prefix επανα-, the verb still follows the same pattern:

• επαναχρησιμοποιώ = I reuse

So the -ώ ending here is what marks first person singular.

Το is the definite article, meaning the.

So:

• το κουτί = the box

Greek articles must agree with the noun in:

• gender
• number
• case

Here κουτί is:

• singular
• neuter

So the correct article is το.

If you wanted a box, you would say:

• ένα κουτί

Because Greek nouns have grammatical gender, and κουτί happens to be a neuter noun.

That is just something you learn with the noun:

• το κουτί = the box

This does not mean the box is somehow naturally neuter in a real-world sense. It is just part of the grammar of the word.

That is why you say:

• το κουτί
• not ο κουτί
• not η κουτί

It is the accusative, because it is the direct object of the verb.

In other words, it is the thing being reused:

• I reuse what?
• the box

So το κουτί is the object.

A detail that can confuse learners: with many neuter singular nouns, the nominative and accusative forms are identical. So here:

• nominative: το κουτί
• accusative: το κουτί

The form does not change, even though the grammatical role does.

Yes. Greek word order is more flexible than English word order.

The sentence:

• Επαναχρησιμοποιώ το κουτί.

is a normal, neutral way to say it.

If you want to emphasize the box, Greek may move it forward, for example:

• Το κουτί το επαναχρησιμοποιώ.

That sounds more like:

• The box, I reuse it
• As for the box, I reuse it

So yes, word order can change, but the original sentence is the most straightforward, neutral version.

The accent marks show which syllable is stressed.

So:

• επαναχρησιμοποιώ → stress on the final -ώ
• κουτί → stress on the final -τί

This is very important in Greek pronunciation.

If you put the stress in the wrong place, people may still understand you, but it will sound unnatural, and in some cases stress can help distinguish between different forms or meanings.

In this sentence, το κουτί is natural if you mean a specific box: the box.

Greek uses articles very regularly, often more regularly than English.

So if you mean:

• a specific known box → το κουτί
• any box / one box → ένα κουτί

Leaving the article out would usually change the feel of the sentence and often sounds less natural in ordinary speech, unless you are speaking in a special style or context.