Κλείνω το κινητό μου ώστε να συγκεντρωθώ στο μάθημα.

That is a very common use of κλείνω in Modern Greek.

• basic meaning: I close / I shut
• with devices, especially phones: I turn off / I switch off

So Κλείνω το κινητό μου means I turn off my phone.

A few related examples:

• Κλείνω την τηλεόραση. = I turn off the TV.
• Κλείνω το φως. = I turn off the light.

So Greek often uses the same verb for close and turn off, depending on the object.

το κινητό μου means my mobile phone.

Breakdown:

• το = the (neuter singular)
• κινητό = mobile phone / cell phone
• μου = my

Here κινητό is neuter singular, and it appears in the accusative because it is the direct object of κλείνω.

In this case, nominative and accusative look the same:

• το κινητό = the phone (subject or object, depending on context)

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

So Greek says:

• το κινητό μου = my phone
• literally: the phone my

This is normal Greek word order. English puts my before the noun, but Greek usually puts μου after it.

You will see this pattern all the time:

• το βιβλίο μου = my book
• η φίλη μου = my friend
• οι γονείς μου = my parents

ώστε να means so that or in order to.

It introduces a clause of purpose or intended result:

• Κλείνω το κινητό μου = I turn off my phone
• ώστε να συγκεντρωθώ στο μάθημα = so that I can concentrate on the lesson

So the second part explains why the speaker turns off the phone.

A very common alternative is για να:

• Κλείνω το κινητό μου για να συγκεντρωθώ στο μάθημα.

This would sound very natural too. In many everyday situations, για να is more common, while ώστε να can sound a bit more formal or more explicitly purposeful.

Because Greek uses να to introduce the subjunctive.

After expressions like ώστε να or για να, Greek normally uses:

• να + verb

So:

• ώστε να συγκεντρωθώ

This is the normal Greek way to express ideas like:

• so that I can concentrate
• in order to concentrate

English often uses can, may, or just the infinitive, but Modern Greek does not use an infinitive in the same way. Instead, it uses να plus a finite verb form.

συγκεντρωθώ is the first person singular aorist subjunctive form.

That sounds technical, but the important idea is this:

• να συγκεντρωθώ = to concentrate / so that I concentrate / so that I can focus

It comes from the verb συγκεντρώνομαι, which means I concentrate / I focus.

Why this form?

• να requires a subjunctive form
• the aorist here usually presents the action as a single whole event: to manage to focus / to focus

So in this sentence, να συγκεντρωθώ is the natural choice.

Great question. It looks like a passive form, but here it does not mean passive in English.

Many Modern Greek verbs use middle/passive-style forms for meanings that are active in English.
συγκεντρώνομαι means:

• I concentrate
• I focus

So:

• να συγκεντρωθώ = to concentrate / to focus

It does not mean that someone else is concentrating you.

This is a very common pattern in Greek. The form may look passive, but the meaning is often active or reflexive in English.

στο is a contraction of:

• σε + το = στο

So:

• στο μάθημα = in the lesson / in class / on the lesson topic, depending on context

In this sentence, the most natural meaning is:

• to concentrate on the lesson
• or to concentrate in class

Also remember that Greek σε covers several meanings that English splits into in, at, on, and to, depending on context.

Both can be right, depending on context.

μάθημα can mean:

• lesson
• class
• school subject

In this sentence, στο μάθημα could mean:

• during the lesson
• in class
• on the lesson

The most natural English translation is usually:

• I turn off my phone so that I can concentrate in class.
• or ...so that I can concentrate on the lesson.

So the exact English wording depends on the situation, but the Greek is perfectly natural.

Because Greek often leaves out subject pronouns when the verb ending already shows who the subject is.

Here:

• Κλείνω = I turn off
• συγκεντρωθώ = that I concentrate / focus

The ending of the verb already tells you it is first person singular, so Greek does not need to say εγώ.

Greek only adds the subject pronoun if it wants emphasis or contrast.

For example:

• Εγώ κλείνω το κινητό μου... = I am the one who turns off my phone...

Without emphasis, leaving out εγώ is normal.

Yes, absolutely.

• Κλείνω το κινητό μου ώστε να συγκεντρωθώ στο μάθημα.
• Κλείνω το κινητό μου για να συγκεντρωθώ στο μάθημα.

Both are correct.

A useful rule of thumb:

• για να = very common in everyday speech
• ώστε να = also correct, sometimes a bit more formal or more explicit

In this sentence, both sound natural, but για να may feel slightly more conversational.

In this sentence, it clearly means turn off my phone.

That is because the sentence continues with a purpose:

• so that I can concentrate on the lesson

If you wanted to say hang up, Greek would more naturally use other expressions depending on context, such as:

• το κλείνω = I hang up
• κλείνω το τηλέφωνο can sometimes mean I end the call, depending on context

But here, with το κινητό μου and the classroom context, the meaning is clearly I switch off my mobile phone.