Breakdown of Прибывший вчера полицейский расследовал преступление.
вчера
yesterday
преступление
crime
полицейский
the policeman
расследовать
to investigate
прибыть
to arrive
Questions & Answers about Прибывший вчера полицейский расследовал преступление.
How is the participle прибывший formed from the verb прибыть?
It is an active past participle. To form it, take the masculine past tense of the perfective verb прибыть, which is прибыл. Drop the -л and add the participle suffix -вш-. Because it modifies the masculine nominative subject полицейский, it takes the standard masculine nominative adjective ending -ий.
Why is the word вчера placed in the middle of the phrase, before the noun?
The words прибывший вчера form a participle clause. In Russian, adverbs like вчера that depend on a participle stay grouped with it. This entire descriptive block acts like one big adjective, so it can comfortably sit right before the noun it modifies: прибывший вчера полицейский. It could also be placed immediately after the noun.
The word полицейский means 'police officer' (a person), so why does it have an adjective ending?
Полицейский is a substantivized adjective: a word that originated as an adjective but is now used as a noun. Because of this, it declines exactly like a regular adjective ending in -ский, even though it is the main noun and subject of this sentence.
Is the verb расследовал perfective or imperfective here?
The verb расследовать (to investigate) is unique because it is biaspectual: the exact same dictionary form is used for both perfective and imperfective meanings! Here, it is in the past tense and likely focuses on the ongoing process of investigating the crime, though context could also allow it to mean he completely finished the investigation.
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