Έχω νεύρα σήμερα, γιατί η σύνδεση στο ίντερνετ δεν λειτουργεί καλά.

Literally, yes: έχω = I have, and νεύρα = nerves.

But έχω νεύρα is an idiomatic expression. It usually means:

• I’m irritated
• I’m annoyed
• I’m in a bad mood
• sometimes I’m angry

So in this sentence, it does not mean that the speaker is calmly talking about their nervous system. It means they feel upset or frustrated.

A close English equivalent is I’m annoyed today or I’m really irritated today.

Because that is how this idiom works in Greek: έχω νεύρα uses the plural form.

Greek often uses plural nouns in fixed expressions where English might not. So even though English learners may expect something like I have anger or I am nervous, Greek naturally says I have nerves.

You should learn έχω νεύρα as a set phrase.

They are related, but not the same.

• έχω νεύρα = I’m annoyed / irritated / angry
• είμαι νευρικός (masculine) / είμαι νευρική (feminine) = I’m nervous / tense

So:

• If you are upset because the internet is not working, έχω νεύρα is natural.
• If you are anxious before an exam, είμαι νευρικός / νευρική is more natural.

This is an important distinction, because English nervous does not match έχω νεύρα very well here.

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

• έχω = I have
• λειτουργεί = it works / is working

So εγώ is not necessary.

You can add εγώ for emphasis, but it would sound stronger, like:

• Εγώ έχω νεύρα σήμερα... = I’m the one who’s annoyed today...

In normal speech, leaving the pronoun out is completely natural.

Here, γιατί means because.

That same word can also mean why, depending on context:

• Γιατί αργείς; = Why are you late?
• Αργώ γιατί έχει κίνηση. = I’m late because there is traffic.

In your sentence, it introduces the reason:

• ...γιατί η σύνδεση στο ίντερνετ δεν λειτουργεί καλά.
• ...because the internet connection isn’t working well.

η σύνδεση means the connection.

• η is the feminine singular definite article = the
• σύνδεση is a feminine noun

So Greek marks gender more clearly than English does. You have to learn the noun together with its article:

• η σύνδεση = the connection

That helps you remember both the gender and how the noun behaves grammatically.

στο is a contraction of:

• σε = in / at / to / on
• το = the

So:

• σε + το = στο

In this sentence:

• η σύνδεση στο ίντερνετ = the connection to/on the internet, more naturally the internet connection

Greek often uses σε in places where English might use in, on, at, or to, so you should think of it as a flexible preposition.

ίντερνετ is a loanword from English, and in Greek it is usually treated as neuter:

• το ίντερνετ = the internet

It is also often indeclinable, meaning its form usually does not change much across cases in everyday use. That is common with some borrowed words.

So in στο ίντερνετ, the article changes because of σε + το, but ίντερνετ itself stays the same.

δεν λειτουργεί καλά means it doesn’t work well or it isn’t functioning properly.

• δεν = not
• λειτουργεί = works / functions
• καλά = well

λειτουργώ / λειτουργεί is common for:

• machines
• devices
• systems
• services
• connections

So it fits very well with η σύνδεση.

In everyday speech, many people also say δεν δουλεύει καλά:

• δουλεύει literally means works
• it is often more conversational

Both are natural, but λειτουργεί can sound a little more formal or technical.

Because it describes how the connection is functioning.

• καλός / καλή / καλό = good as an adjective
• καλά = well as an adverb

Here, καλά modifies the verb λειτουργεί:

• λειτουργεί καλά = works well

Compare:

• καλή σύνδεση = good connection
  Here καλή describes the noun σύνδεση.

• η σύνδεση λειτουργεί καλά = the connection works well
  Here καλά describes the verb.

The sentence uses the present tense:

• έχω = I have / I’m having
• λειτουργεί = it works / it is working

In this context, the present tense describes a current situation:

• the speaker is annoyed today
• the internet connection is currently not working well

Greek present tense often covers both simple present and present continuous ideas, depending on context.

Yes, it can go elsewhere. Greek word order is fairly flexible.

The original sentence:

• Έχω νεύρα σήμερα, γιατί...

is natural and means I’m annoyed today, because...

You could also say:

• Σήμερα έχω νεύρα, γιατί...
• Έχω σήμερα νεύρα, γιατί... (less common, but possible)

The most natural choices are usually:

• Σήμερα έχω νεύρα...
• Έχω νεύρα σήμερα...

Word order in Greek often affects emphasis more than basic meaning.

Because γιατί introduces a subordinate clause giving the reason:

• Έχω νεύρα σήμερα, γιατί η σύνδεση στο ίντερνετ δεν λειτουργεί καλά.

The comma helps separate:

1. the main clause: Έχω νεύρα σήμερα
2. the reason clause: γιατί η σύνδεση στο ίντερνετ δεν λειτουργεί καλά

This is standard punctuation in Greek.

A rough pronunciation guide is:

EHO NEV-ra si-me-ra, ya-TI i SIN-de-si sto IN-ter-net den li-tour-GHI ka-LA

A few useful notes:

• χ in έχω is like the ch in Scottish loch or German Bach
• γιατί sounds roughly like ya-TEE
• σύνδεση has the stress on the first syllable: SYN-de-si
• λειτουργεί has stress on the last syllable: li-tour-GHEE
• καλά has stress on the last syllable: ka-LA

The written accent marks in Greek show you where the stress goes, which is very helpful for pronunciation.

Yes. This sentence is already natural, but in casual speech you might also hear:

• Έχω νεύρα σήμερα, γιατί το ίντερνετ δεν δουλεύει καλά.
• Έχω σπάσει τα νεύρα μου με το ίντερνετ σήμερα.
  This is stronger and more emotional.

The original sentence is a good, clear standard version. A casual speaker might replace η σύνδεση στο ίντερνετ with simply το ίντερνετ, especially if the context is obvious.