Πριν από τη μετακόμιση θέλω να αγοράσω καθρέφτη, σαμπουάν και μια καινούρια χτένα για το μπάνιο.

Πριν από means before when it is followed by a noun phrase.

So in πριν από τη μετακόμιση, it means before the move / before moving house.

Why two words?

• πριν = before
• από is the preposition that normally goes with a noun here

In everyday speech, you may also hear πριν τη μετακόμιση, but πριν από τη μετακόμιση is the full, standard form and a very safe choice for learners.

Because από is a preposition, and after it Greek uses the accusative case.

So:

• η μετακόμιση = nominative, the subject form
• τη μετακόμιση = accusative, the form used after this preposition

Even though μετακόμιση itself looks the same in nominative and accusative, the article changes:

• η → nominative
• τη(ν) → accusative

The feminine accusative article is basically τη(ν). The final -ν is sometimes kept and sometimes dropped depending on the sound that follows.

Here the next word is μετακόμιση, which begins with μ, so writing τη μετακόμιση is normal and standard.

You may still see την in some contexts or writing styles, but τη μετακόμιση is completely natural here.

In Modern Greek, verbs like θέλω do not take an infinitive the way English does.

English says:

• I want to buy

Greek says:

• θέλω να αγοράσω

So να introduces the verb that follows. You can think of it as part of the normal pattern after θέλω:

• θέλω να πάω = I want to go
• θέλω να δω = I want to see
• θέλω να αγοράσω = I want to buy

So θέλω αγοράσω would be ungrammatical in Modern Greek.

Because αγοράσω here is the aorist/perfective form used after να for a single complete action.

The idea is:

• I want to buy these things = one completed shopping action

So:

• θέλω να αγοράσω = I want to buy
• θέλω να αγοράζω would suggest something more like I want to be buying / I want to buy regularly, which does not fit this sentence

This is a very common Greek distinction:

• να
  • perfective form for a single whole event
• να
  • imperfective form for repetition, duration, or habit

Greek often allows a bare noun in shopping-list or indefinite contexts where English would usually need a or some.

So:

• να αγοράσω καθρέφτη = to buy a mirror
• να αγοράσω έναν καθρέφτη = to buy a mirror

Both are possible.

The version without the article can sound a bit like a list of items to get:

• mirror, shampoo, and a new comb

English normally requires an article, but Greek is freer here.

Greek does not always make lists perfectly symmetrical the way English often does.

In this sentence:

• καθρέφτη and σαμπουάν are presented as general items to buy
• μια καινούρια χτένα is a bit more specific, because the speaker highlights a new comb

The article μια helps package that noun phrase as a fuller, more individualized item.

Also, σαμπουάν is often treated like a substance or general shopping item, so using it without an article is especially natural.

You could also say:

• έναν καθρέφτη, σαμπουάν και μια καινούρια χτένα
• έναν καθρέφτη, ένα σαμπουάν και μια καινούρια χτένα

Those would also be grammatical, but they sound slightly different in style and specificity.

Καινούρια is the adjective new, and it has to agree with χτένα.

Since χτένα is:

• feminine
• singular
• accusative

the adjective is also feminine singular in the matching form:

• μια καινούρια χτένα

A useful point: in this case, the feminine singular nominative and accusative forms are the same, so καινούρια looks the same in both.

You may also see καινούργια instead of καινούρια. Both are common.

They are all direct objects of αγοράσω, so they are in the accusative case.

You can see it most clearly with καθρέφτης:

• nominative: ο καθρέφτης
• accusative: τον καθρέφτη

For the other two:

• σαμπουάν is an indeclinable loanword, so its form does not change
• χτένα has the same form in nominative and accusative singular, so the article/adjective help show its role

Yes. Σαμπουάν is a loanword and is usually treated as indeclinable, so the word itself stays the same.

For example:

• το σαμπουάν
• αγοράζω σαμπουάν
• θέλω το σαμπουάν

The article may change, but the noun σαμπουάν usually does not.

Most naturally, για το μπάνιο means for the bathroom and applies to the whole shopping list:

• a mirror, shampoo, and a new comb for the bathroom

Because it comes after the whole list, it can be understood as describing the group of items.

That said, just as in English, the exact scope can sometimes depend on context. If the speaker especially means the comb is for the bathroom, the sentence can still allow that reading. But the most natural interpretation is that all the items are bathroom-related.

Because το μπάνιο here means the bathroom as a room.

So:

• για το μπάνιο = for the bathroom

But για μπάνιο usually means something more like:

• for bathing
• for a swim
• to go bathe / go swimming

So the article is important here because it points to the room, not the activity.

Yes, you could.

Greek word order is fairly flexible. The sentence starts with Πριν από τη μετακόμιση to set the time frame first, a bit like:

• Before the move, I want to buy...

If you say:

• Θέλω να αγοράσω καθρέφτη, σαμπουάν και μια καινούρια χτένα για το μπάνιο πριν από τη μετακόμιση

that is also grammatical. It just places the time information later, so the focus shifts slightly.

Starting with Πριν από τη μετακόμιση sounds very natural because it frames the whole plan right away.