Oni grają wieczorem.

They play in the evening.

Breakdown of Oni grają wieczorem.

• oni: they
• wieczorem: in the evening
• grać: to play

Questions & Answers about Oni grają wieczorem.

Why is the subject oni used here? Can it be omitted?

In Polish, subject pronouns like oni (they) are usually optional because the verb ending already shows the person and number.

• Oni grają wieczorem. – fully explicit, maybe emphasizing they.
• Grają wieczorem. – completely correct and very natural: They play in the evening / They are playing this evening.

You keep oni when you:

• contrast with someone else: Oni grają wieczorem, a my rano. (They play in the evening, and we in the morning.)
• want to be extra clear who you are talking about.

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What is the difference between oni and one?

Both mean they, but Polish distinguishes by gender/type:

• oni – used for groups that include at least one adult male (masculine personal):
  
  • a group of men
  • a mixed group (men + women)
• one – used for:
  • all-female groups
  • groups of things or animals (non‑masculine‑personal plural)

So:

• A group of male or mixed players: Oni grają wieczorem.
• A group of only women: One grają wieczorem.
• A group of dogs or chairs: One są tutaj.

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What exactly does grają mean: they play or ?