Przeprowadzamy się dopiero za tydzień, więc na razie śpimy jeszcze u mojej siostry.

Polish often uses the present tense of an imperfective verb to talk about a planned or scheduled future event.

• przeprowadzać się = imperfective, to be moving / to move house
• przeprowadzamy się = literally we are moving, but here it means we’re moving in the future

So:

• Przeprowadzamy się za tydzień = We’re moving in a week
• Przeprowadzimy się za tydzień is also possible, but it sounds more like a completed future event: We will move in a week / We’ll have moved in a week

In everyday speech, the present tense is very common for arrangements and plans.

In this verb, się is part of the expression przeprowadzać się / przeprowadzić się, which means to move house / to relocate oneself.

Compare:

• przeprowadzać kogoś = to move someone / to transfer someone
• przeprowadzać się = to move oneself, כלומר to move house

So się does not translate neatly as a separate English word here. It is simply part of the verb.

Here dopiero means something like:

• only
• not until
• as late as

So:

• Przeprowadzamy się dopiero za tydzień = We’re only moving in a week / We’re not moving until next week

It adds the idea that the move is later than one might expect or not happening yet.

A few examples:

• Mam dopiero dwadzieścia lat. = I’m only twenty.
• Dopiero jutro wracam. = I’m not coming back until tomorrow.

Here za tydzień means in a week / a week from now.

This is a very common Polish time expression:

• za godzinę = in an hour
• za dwa dni = in two days
• za miesiąc = in a month

It does not mean for a week.

If you want to say for a week, Polish would use something like:

• przez tydzień = for a week
• sometimes tydzień by itself, depending on the sentence

So:

• Przeprowadzamy się za tydzień = We’re moving in a week
• Mieszkaliśmy tam przez tydzień = We lived there for a week

They are similar in feeling, but they do different jobs.

• na razie = for now / for the time being
• jeszcze = still

So:

• na razie sets the temporary situation
• jeszcze emphasizes that the situation continues up to now

Together:

• więc na razie śpimy jeszcze u mojej siostry
  = so for now we’re still sleeping at my sister’s place

If you remove one of them, the sentence still works, but the nuance changes:

• na razie śpimy u mojej siostry = for now we’re sleeping at my sister’s place
• śpimy jeszcze u mojej siostry = we’re still sleeping at my sister’s place

Using both sounds very natural and expressive.

Na razie means for now, for the time being, at the moment in this temporary situation.

It is not exactly the same as teraz.

• teraz = now in a direct time sense
• na razie = for now / for the moment, often with the idea that this may change later

Compare:

• Teraz śpię. = I’m sleeping now.
• Na razie śpię u siostry. = For now I’m sleeping at my sister’s place.

So na razie is perfect here because the arrangement is temporary until the move happens.

The preposition u is very commonly used with people to mean:

• at someone’s place
• with someone
• sometimes at in the sense of visiting or staying with a person

So:

• u mojej siostry = at my sister’s place
• literally, something like with my sister

Other examples:

• Jestem u mamy. = I’m at my mom’s place.
• Byliśmy u znajomych. = We were at our friends’ place.
• Mieszkam u cioci. = I live at my aunt’s place.

This is a very important everyday pattern in Polish.

Because the preposition u requires the genitive case.

The dictionary form is:

• moja siostra = my sister

But after u, it changes to genitive:

• u mojej siostry = at my sister’s place

Case breakdown:

• moja siostra — nominative
• mojej siostry — genitive

This is one of the most useful things to remember about u: u + genitive

Using śpimy focuses on the fact that they are sleeping overnight / staying temporarily at the sister’s place.

• śpimy u mojej siostry = we sleep / are sleeping at my sister’s place
• mieszkamy u mojej siostry = we live at my sister’s place

Both could be possible depending on context, but they are not exactly the same.

Here, śpimy suggests a temporary arrangement, almost like:

• we’re staying with my sister for now
• we’re sleeping at my sister’s place for the time being

If the speaker wanted to stress residence rather than temporary overnight staying, mieszkamy might fit better.

Yes. Śpimy is ordinary present tense: we sleep / we are sleeping.

In this sentence it refers to the current state:

• na razie śpimy jeszcze u mojej siostry = for now we’re still sleeping at my sister’s place

This is not a future use like przeprowadzamy się. It is genuinely about what is happening now.

So the sentence mixes:

• a planned future: przeprowadzamy się dopiero za tydzień
• a present temporary situation: na razie śpimy jeszcze u mojej siostry

Więc means so, therefore, or thus.

It connects the two parts logically:

• We’re only moving in a week, so for now we’re still sleeping at my sister’s place.

It is a very common conversational connector.

Compare:

• Jest późno, więc idę spać. = It’s late, so I’m going to bed.
• Nie mam czasu, więc nie przyjdę. = I don’t have time, so I won’t come.

Polish word order is fairly flexible, but the original order sounds very natural.

Original:

• Przeprowadzamy się dopiero za tydzień, więc na razie śpimy jeszcze u mojej siostry.

You could rearrange parts for emphasis, for example:

• Dopiero za tydzień się przeprowadzamy...
• Na razie jeszcze śpimy u mojej siostry...

But each version slightly changes emphasis.

In the original:

• dopiero za tydzień naturally highlights the delay
• na razie sets up the temporary situation
• jeszcze reinforces that it is continuing

So yes, word order can move, but this version is smooth and idiomatic.

This verb has an aspect pair:

• przeprowadzać się — imperfective
• przeprowadzić się — perfective

Very roughly:

• imperfective = process, repeated action, planned action, general action
• perfective = completed single action

Examples:

• Kiedy się przeprowadzacie? = When are you moving?
  Planned future, so imperfective is common.
• W końcu się przeprowadziliśmy. = We finally moved.
  Completed event, so perfective.

In your sentence, the imperfective przeprowadzamy się is used because it sounds natural for an upcoming plan or arrangement.

Not exactly, though in many situations the English translation may become next week.

Strictly speaking:

• za tydzień = in a week, one week from now
• w przyszłym tygodniu = next week

These are close, but not always identical.

For example, if today is Tuesday:

• za tydzień = next Tuesday
• w przyszłym tygodniu = sometime in the following calendar week

In natural translation, Przeprowadzamy się dopiero za tydzień may become We’re not moving until next week, because that sounds more natural in English, even if the Polish literally means in a week.

Yes, very natural.

It sounds like normal spoken or informal written Polish. It combines several very common everyday expressions:

• przeprowadzać się
• dopiero
• za tydzień
• więc
• na razie
• jeszcze
• u mojej siostry

A native speaker would understand it immediately, and it sounds like something someone would actually say in conversation.