Μερικές φορές νοσταλγώ το χωριό μου, ιδίως όταν βλέπω βροχή πάνω από το βουνό.

Μερικές φορές means sometimes.

Literally, it is something like some times:

• μερικές = some / a few (feminine plural)
• φορές = times / occasions (feminine plural)

They are both plural because the expression is built around φορές, which is a plural noun. Greek commonly uses this plural phrase where English often just uses the single word sometimes.

You may also see:

• καμιά φορά / καμιά φορές in some speech styles = sometimes
• μερικές φορές is a very standard, neutral choice.

Yes. Νοσταλγώ means I miss, I long for, or I feel nostalgic for.

In this sentence:

• νοσταλγώ το χωριό μου = I miss my village

The verb takes a direct object:

• νοσταλγώ κάποιον = I miss someone
• νοσταλγώ κάτι = I miss something

So unlike English, where learners may think in terms of I feel nostalgia, Greek simply uses the verb directly.

A few examples:

• Νοσταλγώ την οικογένειά μου. = I miss my family.
• Νοσταλγώ τα παιδικά μου χρόνια. = I miss my childhood years.

This verb is a bit more emotional or literary than some other ways of expressing missing someone/something.

Το χωριό μου is the normal way to say my village.

Breakdown:

• το χωριό = the village
• μου = my (literally the weak genitive form of me)

So Greek often expresses possession as:

• the noun + μου / σου / του / της / μας / σας / τους

Examples:

• το σπίτι μου = my house
• η αδερφή της = her sister
• τα βιβλία μας = our books

The order μου το χωριό is not the neutral pattern here. Greek normally places the weak possessive pronoun after the noun.

If you want strong emphasis, Greek may use δικός μου / δική μου / δικό μου, but that is a different structure:

• το δικό μου χωριό = my own village / my village (emphatic)

Greek uses the definite article much more often than English.

So το χωριό μου is the standard way to say my village. The article is normally kept with possessive expressions.

Compare:

• το βιβλίο μου = my book
• η μητέρα μου = my mother
• το χωριό μου = my village

Leaving out the article would usually sound unnatural in a basic sentence like this.

Ιδίως means especially, particularly, or above all.

In this sentence:

• ιδίως όταν... = especially when...

It is correct and fairly standard. It can sound a little more formal or polished than some everyday alternatives.

Common alternatives include:

• ειδικά = especially
• κυρίως = mainly / especially
• πάνω απ’ όλα = above all (depending on context)

So:

• ιδίως όταν βλέπω...
• ειδικά όταν βλέπω...

Both work, but ιδίως has a slightly more elevated feel.

Because the sentence describes a habitual / repeated situation.

The idea is:

• Sometimes I miss my village, especially when I see rain over the mountain.

This is not about one single future event. It is about what usually happens. So Greek uses the present tense:

• όταν βλέπω = when I see / whenever I see

This is very natural for repeated actions.

Compare:

• Όταν βλέπω βροχή, σκέφτομαι το χωριό μου.
  = When(ever) I see rain, I think of my village.

But for a one-time future event, Greek would use a different pattern:

• Όταν δω βροχή, θα...
  = When I see rain, I will...

So here βλέπω is used because the meaning is general and recurring.

Because βροχή here is being used in a general, non-specific way.

• βλέπω βροχή = I see rain

Greek often omits the article with nouns when talking about something indefinite or as a general phenomenon, especially with mass nouns like:

• νερό = water
• βροχή = rain
• χιόνι = snow

So:

• βλέπω βροχή = I see rain
• βλέπω τη βροχή would sound more like I see the rain, referring to some specific rain already identified in context.

In this sentence, the speaker is not talking about one particular rainstorm already known to both speaker and listener. It is just the sight of rain in general that triggers the feeling.

Πάνω από το βουνό means above the mountain or over the mountain.

Breakdown:

• πάνω = up / above
• από = from, but in this fixed expression πάνω από it means over / above
• το βουνό = the mountain

So πάνω από works together as a phrase:

• πάνω από το σπίτι = above the house
• πάνω από τη θάλασσα = over the sea
• πάνω από το βουνό = over the mountain

In the sentence, it probably suggests the speaker sees rain clouds or rainfall appearing in the sky over the mountain, and that sight makes them nostalgic.

It is in the accusative case, because in Modern Greek many prepositions, including από, are followed by the accusative.

So:

• από το βουνό
• πάνω από το βουνό

The noun is:

• το βουνό = the mountain

For neuter singular nouns like βουνό, the nominative and accusative forms are the same, so you do not see a change in the article or noun here.

Compare with a feminine noun, where the accusative is easier to notice:

• η θάλασσα = nominative
• πάνω από τη θάλασσα = accusative after the preposition

Greek word order is fairly flexible, although this sentence is already very natural.

Standard version:

• Μερικές φορές νοσταλγώ το χωριό μου, ιδίως όταν βλέπω βροχή πάνω από το βουνό.

You could move parts around for emphasis, for example:

• Ιδίως όταν βλέπω βροχή πάνω από το βουνό, νοσταλγώ το χωριό μου.
• Το χωριό μου το νοσταλγώ μερικές φορές...
  This gives extra emphasis to το χωριό μου.

But the original order is smooth and neutral. For learners, it is a very good model to follow.

It sounds natural, but also a little emotional and reflective.

A few things create that tone:

• νοσταλγώ is a feeling-heavy verb
• ιδίως sounds slightly polished
• the image of rain over the mountain gives the sentence a vivid, almost literary feel

So it is not strange or overly formal, but it is more expressive than something very plain like:

• Μερικές φορές μου λείπει το χωριό μου.

That alternative also means Sometimes I miss my village, but νοσταλγώ adds a stronger sense of longing and memory.