По ознакомлении с отчётом клиент успокоился.

Questions & Answers about По ознакомлении с отчётом клиент успокоился.

Why does ознакомлении end in -ии here?
In this sentence, the preposition по means "upon" or "immediately after." When по is used with this specific time-related meaning, it requires the Prepositional case. The nominative form of the word is ознакомление (a neuter noun ending in -ие). In the Prepositional case, nouns ending in -ие always change their ending to -ии.
Could I just say после ознакомления instead of по ознакомлении?
Yes, and in everyday speech you definitely should! Using по + Prepositional to mean "after" is highly formal and mostly found in official documents, business correspondence, or literature. После + Genitive (после ознакомления) is the standard, neutral way to express this idea.
Why is the report (отчёт) in the Instrumental case here (с отчётом)?
The case is determined by the noun ознакомление (familiarization), which is derived from the verb ознакомиться (to familiarize oneself). This verb requires the preposition с followed by the Instrumental case (to familiarize oneself with something). Verbal nouns often inherit the case requirements of the verbs they come from, so ознакомление also takes с + Instrumental.
What is the root of the verb успокоился, and why does it have the -ся ending?
The root comes from the noun покой (peace, rest). The base verb успокоить means "to calm [someone else] down" (for example, a crying child). Adding the reflexive suffix -ся turns the action back onto the subject, meaning the client calmed himself down, or simply "became calm."

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