Question 1

Why use при выполнении instead of a normal 'when' clause like когда мы выполняем?

Accepted Answer

Using при + Prepositional case with a verbal noun (like выполнение, meaning 'execution' or 'performing') is a concise way to express a simultaneous circumstance. While когда мы выполняем is perfectly fine for everyday speech, при выполнении sounds slightly more formal and professional, translating closer to 'during the performance of'.

Question 2

Why is этой работы in the Genitive case here?

Accepted Answer

It acts as the object of the verbal noun выполнении. When an action verb that normally takes the Accusative case (like выполнять работу) is turned into a noun, its object is always placed in the Genitive case (выполнение работы). This is exactly equivalent to saying 'the doing OF the work' in English.

Question 3

Could I use the gerund выполняя instead to say 'when doing'?

Accepted Answer

Yes, you can! Выполняя эту работу, мы часто ошибаемся is a very natural alternative. The difference is mostly stylistic: the gerund выполняя focuses on the action itself, while при выполнении acts as a noun phrase and leans toward a slightly more formal, instructional, or technical register.

Question 4

I see ошибаемся ends in the reflexive particle -ся. Can I use it without the -ся?

Accepted Answer

No, the verb ошибаться (to make a mistake or to be wrong) only exists in the reflexive form in modern standard Russian. You cannot strip the -ся away to make a regular active verb here.

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