Για την παραλία παίρνω συνήθως σανδάλια, αλλά η αδερφή μου φοράει μόνο σαγιονάρες.

Here για + accusative means for in the sense of for the beach / when going to the beach / as beachwear.

So Για την παραλία παίρνω συνήθως σανδάλια is literally something like:

• For the beach, I usually take sandals

It does not mainly mean physical movement to the beach. If you wanted to emphasize movement to the beach, Greek would more naturally use something like στην παραλία.

So in this sentence, για την παραλία sets the context: as far as the beach is concerned or when it comes to the beach.

Because για takes the accusative case, so the noun and article must be in the accusative.

With παραλία:

• nominative: η παραλία
• accusative: την παραλία

So:

• η παραλία = the beach as the subject
• για την παραλία = for the beach

This is a very common pattern in Greek: many prepositions are followed by the accusative.

Παίρνω means I take. In this sentence, the idea is that the speaker takes / brings / packs sandals for the beach.

So the contrast is:

• I usually take sandals
• but my sister wears only flip-flops

Greek uses two different verbs because the actions are different:

• παίρνω = take, bring, pack
• φοράω / φοράει = wear

So the speaker is talking about what they bring along, while the sister is described by what she actually wears.

Συνήθως means usually.

In this sentence:

• παίρνω συνήθως σανδάλια = I usually take sandals

Greek adverbs like συνήθως are fairly flexible in position. You could also hear:

• Συνήθως παίρνω σανδάλια για την παραλία
• Για την παραλία συνήθως παίρνω σανδάλια

The meaning stays basically the same, but the emphasis shifts a little depending on word order. Greek often moves words around more freely than English.

Because in both English and Greek, this kind of footwear is normally referred to as a pair, so the plural is the natural form.

• σανδάλια = sandals
• σαγιονάρες = flip-flops

Greek can use the singular form in some contexts, but when talking about what someone wears or brings, the plural is the normal choice.

This is similar to how English often uses plural words for things worn on both feet.

They are both kinds of footwear, but they are not the same.

• σανδάλια = sandals in general
• σαγιονάρες = flip-flops

So σαγιονάρες are a more specific type of light beach footwear. The sentence contrasts a broader category (sandals) with a very specific one (flip-flops).

In Greek, it is very common to use the definite article with family members and possessed nouns.

So Greek naturally says:

• η αδερφή μου = my sister
• ο αδερφός μου = my brother
• η μητέρα μου = my mother

English usually does not use the here, but Greek often does. So although it literally looks like the sister my, it simply means my sister.

Because μου here is an unstressed possessive pronoun, and in Greek these usually come after the noun.

So:

• η αδερφή μου = my sister
• το σπίτι μου = my house
• ο φίλος μου = my friend

This is one of the most common Greek word-order patterns. English says my sister, but Greek usually says the equivalent of the sister my.

Because the subject is η αδερφή μου = my sister, which is third person singular.

The verb φοράω means to wear. Its present-tense form here is:

• φοράει = she wears / is wearing

So:

• εγώ φοράω = I wear
• η αδερφή μου φοράει = my sister wears

You may also sometimes see related spellings or forms in dictionaries and formal language, but φοράει is the normal everyday form learners will hear all the time.

Μόνο means only.

Here it goes with σαγιονάρες:

• φοράει μόνο σαγιονάρες = she wears only flip-flops

That means flip-flops are the only kind of footwear she wears in this context.

Its position is important because it tells you what is being limited. Here the natural reading is that flip-flops are the only thing she wears.

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

This sentence could be rearranged in different ways, for example:

• Συνήθως παίρνω σανδάλια για την παραλία, αλλά η αδερφή μου φοράει μόνο σαγιονάρες.
• Για την παραλία συνήθως παίρνω σανδάλια, αλλά η αδερφή μου μόνο σαγιονάρες φοράει.

These versions are still grammatical, but the emphasis changes:

• putting Για την παραλία first highlights the context
• putting συνήθως earlier highlights the habit
• moving μόνο can strengthen the focus on flip-flops

So the original order is natural, but not the only possible one.

Both exist.

• αδερφή is the very common everyday form in Modern Greek
• αδελφή is also correct, but it can sound more formal or traditional depending on context

A learner will very often hear and see αδερφή in ordinary speech, so the sentence sounds completely natural.