После обеда я возвращаюсь в библиотеку.

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Breakdown of После обеда я возвращаюсь в библиотеку.

• в: to
• библиотека: the library
• после: after

Questions & Answers about После обеда я возвращаюсь в библиотеку.

Why is обеда in the genitive case?

Because the preposition после always takes the genitive case, indicating sequence: “after lunch.”

Why is в библиотеку in the accusative case?

Because в with the accusative expresses motion into a place: here it means “return to the library.” If you were already in the library and speaking about location, you’d use в библиотеке (locative).

What does the suffix -ся add to возвращаюсь?

It makes the verb reflexive. Возвращаться means “to return” or “to come back” (on one’s own), not “to return something.”

Why use the present tense я возвращаюсь for a future action instead of the future tense я вернусь?

• Вернуться is the perfective infinitive (“to return” with focus on completion), so its future is я вернусь and stresses the act’s endpoint.
• Возвращаться is imperfective (“to be returning”) and in present tense can express scheduled or near-future actions or habitual routines. Here it implies a planned or repeated return.

What is the infinitive form of возвращаюсь, and how is it conjugated for я?