Купание в реке полезно летом.

Bathing in the river is beneficial in summer.

Breakdown of Купание в реке полезно летом.

• в: in
• река: the river
• купание: the bathing
• полезный: beneficial
• летом: in summer

Questions & Answers about Купание в реке полезно летом.

What is the function of купание in this sentence?

купание is a noun (gerund) derived from the verb купаться. It stands for the action “bathing” or “taking a dip” and functions as the sentence’s subject: “The act of bathing in the river…”

Why is в реке in the prepositional case?

The preposition в meaning “in” requires the prepositional case when indicating location. The noun река takes the form реке after в, so в реке means “in the river.”

Why is полезно in the neuter form?

полезно is the short-form adjective used predicatively. In Russian, such adjectives agree in gender and number with the subject. Here the subject купание is neuter singular, so the predicate полезно is also neuter singular.

What role does летом play, and why is it in the instrumental case?

летом expresses a time frame (“in summer”). Russian often uses the instrumental case (without a preposition) to denote when something happens: утром (in the morning), вечером (in the evening), зимой (in winter), летом (in summer).

Can I reverse the word order to say Летом полезно купаться в реке?

Yes. Russian has flexible word order. Летом полезно купаться в реке places emphasis on летом but conveys the same meaning. You could also say Купаться в реке летом полезно without changing the sense.

What is the difference between купание and плавание?

Купание focuses on the act of bathing or cooling off (you go into the water to refresh yourself). Плавание refers to the activity or sport of swimming—propelling yourself through water over distances.

Could I say Купаться в реке полезно летом instead of Купание в реке полезно летом? How do they differ?

Yes. Купаться в реке полезно летом uses the infinitive купаться as the subject. The nuance is identical: “It is good to bathe in the river in summer.” Using the infinitive is often more colloquial, while купание feels a bit more formal or abstract.