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Questions & Answers about Микроволновка была куплена вчера.
What is the structure of the passive construction in the sentence "Микроволновка была куплена вчера."?
The passive construction is formed by combining the auxiliary verb была (the feminine past tense of быть, meaning “to be”) with the past passive participle куплена (derived from купить, “to buy”). This construction agrees in gender and number with the subject Микроволновка (a feminine singular noun), effectively translating to "was bought."
Why does the participle куплена end with -на in this sentence?
The ending -на in куплена indicates that the participle is in its short form and agrees with a feminine singular subject. In Russian, past passive participles must match the gender, number, and sometimes the case of the noun they describe—in this instance, Микроволновка is feminine and singular, so the participle takes the ending -на.
How does the sentence indicate the timing of the action?
The adverb вчера means yesterday and specifies when the action took place. In this sentence, it comes at the end, which is a common placement in Russian to provide temporal context without interrupting the core subject–verb construction.
Why is the agent (the one who bought the microwave) not mentioned in the sentence?
In passive constructions both in Russian and in English, the agent is often omitted when it is either unknown or not important to the context. The focus here is on the microwave and the fact that it was purchased yesterday, rather than on who performed the action.
How can this sentence be rephrased using an active construction?
An active construction could be: Кто-то купил микроволновку вчера. This translates to "Someone bought the microwave yesterday." Here, Кто-то serves as a generic subject, and the active verb купил is used, shifting the focus to the agent performing the action rather than on the item itself.