Wieczorem rozbijemy namiot na łące obok lasu.

In the evening we will pitch a tent in the meadow next to the forest.

Breakdown of Wieczorem rozbijemy namiot na łące obok lasu.

• wieczorem: in the evening
• na: in
• obok: next to
• las: the forest

Questions & Answers about Wieczorem rozbijemy namiot na łące obok lasu.

Why is it wieczorem and not wieczór or w wieczór?

Wieczorem is the instrumental form of wieczór (evening), and in Polish the instrumental is very often used to express “when?” for parts of the day.

So:

• wieczór – evening (nominative, dictionary form)
• wieczorem – in the evening (instrumental, used adverbially)

Common time expressions that work the same way:

• latem – in (the) summer (from lato)
• zimą – in (the) winter (from zima)
• nocą – at night (from noc)

You can say wieczorem on its own; you don’t need w here.
W wieczór is not natural in modern Polish in this meaning.

How is the future formed in rozbijemy? Why not będziemy rozbijać?