Za miastem lubię spacerować po lesie.

I

Breakdown of Za miastem lubię spacerować po lesie.

• lubić: to like
• miasto: the city
• po: in

Questions & Answers about Za miastem lubię spacerować po lesie.

Why is it za miastem and not za miasto?

Because za can take different cases depending on the meaning.

In this sentence, za miastem means outside the city / beyond the city, describing a location, not motion toward a destination. When za expresses location here, Polish uses the instrumental case.

• miasto = city
• miastem = instrumental singular of miasto

Compare:

• Jestem za miastem. = I am outside the city.
• Jadę za miasto. = I am going outside the city.

So za miastem fits because the sentence is about where the walking happens, not about going there.

What case is miastem, and why does it change from miasto?

Miastem is the instrumental singular form of miasto.

The basic form is:

• miasto = city

After the preposition za in the sense of behind/beyond/outside when talking about location, Polish uses the instrumental, so:

• za miastem = outside the city / beyond the city

This kind of case change is very normal in Polish. Prepositions often force a specific case.

What exactly does za miastem mean here?