Περιμένω στην αποβάθρα μέχρι να έρθει το επόμενο τρένο.

In Greek, the verb ending usually tells you who the subject is, so the subject pronoun is often omitted.

• Περιμένω = I wait / I am waiting
• The ending -ω shows first person singular: I

So Εγώ is not necessary unless you want emphasis or contrast:

• Εγώ περιμένω, όχι αυτός. = I’m waiting, not him.

Greek does this much more often than English.

It can mean both.

Greek present tense often covers both:

• I wait
• I am waiting

So Περιμένω στην αποβάθρα... could mean:

• I’m waiting on the platform...
  or
• I wait on the platform...

In this sentence, the most natural English translation is usually I’m waiting on the platform until the next train comes/arrives.

στην is a very common contraction:

• σε = in / at / on / to
• την = the (feminine accusative singular)

So:

• σε την → στην

That means:

• στην αποβάθρα = on / at the platform

This contraction is standard in everyday Greek.

Similar examples:

• στο = σε + το
• στον = σε + τον

It is in the accusative singular, because the preposition σε normally takes the accusative.

Here is the noun:

• nominative: η αποβάθρα
• accusative: την αποβάθρα

So after σε:

• σε την αποβάθρα → στην αποβάθρα

For a learner, the key point is:

• σε usually goes with the accusative
• the article changes accordingly

Αποβάθρα means platform, especially a railway or station platform.

So:

• στην αποβάθρα = on the platform

Depending on context, English may prefer on the platform rather than at the platform.

μέχρι να means until and introduces a clause about something that has not happened yet.

So:

• μέχρι να έρθει το επόμενο τρένο = until the next train comes / arrives

This is a very common Greek structure:

• μέχρι να τελειώσω = until I finish
• μέχρι να γυρίσει = until he/she comes back

The important pattern is:

• μέχρι να + subjunctive verb

Because after μέχρι να, Greek uses the subjunctive, marked by να.

So the structure is not:

• μέχρι έρχεται ❌
• μέχρι θα έρθει ❌

but:

• μέχρι να έρθει ✅

This is one of the most important things to get used to in Greek:
after certain words and expressions, Greek uses να + verb instead of the patterns English uses.

έρθει is the aorist subjunctive form of έρχομαι (to come), used after να.

Compare:

• έρχεται = he/she/it comes / is coming
  
  • present indicative
• να έρθει = for it to come / that it come / until it comes
  
  • aorist subjunctive

Why the aorist here? Because the sentence refers to a single completed event:

• the next train arrives once

Greek often uses the aorist subjunctive for this kind of one-time event.

Yes. It comes from έρχομαι (I come), but this verb is irregular, so its forms can look quite different.

Some useful forms:

• έρχομαι = I come / I am coming
• ήρθα = I came
• να έρθω = that I come
• να έρθει = that he/she/it come

So in your sentence:

• να έρθει το επόμενο τρένο = for the next train to come / until the next train comes

It is normal to have to memorize these forms rather than trying to predict them from the present stem alone.

Because τρένο is a neuter singular noun, so both the article and adjective must agree with it.

• το = neuter singular the
• επόμενο = next in neuter singular form
• τρένο = train

So:

• το επόμενο τρένο = the next train

This is adjective agreement:

• masculine noun → masculine adjective form
• feminine noun → feminine adjective form
• neuter noun → neuter adjective form

Yes, but το επόμενο τρένο is the most neutral and common order.

Most naturally:

• το επόμενο τρένο = the next train

You may also encounter:

• το τρένο το επόμενο

but that is less neutral and more stylistically marked. For everyday learning, use:

• article + adjective + noun

Because Greek does not always express future meaning with the future tense.

After μέχρι να, Greek uses:

• να + subjunctive

even when the meaning is future from the speaker’s point of view.

So English thinks:

• until the next train arrives / will arrive

But Greek says:

• μέχρι να έρθει το επόμενο τρένο

This is a grammar pattern you should learn as a whole, rather than translating word-for-word from English.

Yes. Greek word order is more flexible than English, because the endings and articles carry a lot of grammatical information.

The original sentence is neutral and natural:

• Περιμένω στην αποβάθρα μέχρι να έρθει το επόμενο τρένο.

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

• Μέχρι να έρθει το επόμενο τρένο, περιμένω στην αποβάθρα.

That still means the same thing, but the focus shifts slightly.
For a learner, the original order is the safest and most natural one to use.

A rough pronunciation guide is:

pe-ri-ME-no stin a-po-VA-thra MEH-khri na ER-thi to e-PO-me-no TRE-no

A few notes:

• Περιμένω stresses -μέ-
• αποβάθρα stresses -βά-
• έρθει stresses the first syllable
• τρένο stresses τρέ-

Also:

• θ sounds like th in think
• δ would sound like th in this
• χ in μέχρι is a harsher sound, not exactly an English k or h

It could be either, depending on context, because Περιμένω is present tense.

It may mean:

• I’m waiting on the platform until the next train comes
  
  • something happening now

or

• I wait on the platform until the next train comes
  
  • something habitual or repeated

Without extra context, most people will understand it as a current situation: I’m waiting...