Question 1

Why do "пятого" and "десятого" change form, but "две тысячи" stays exactly the same?

Accepted Answer

In Russian, years are spoken as ordinal numbers (like "the two thousand and fifth year"). When changing compound ordinal numbers into the Genitive case for the prepositions с and до, only the very last word changes. Две тысячи stays in its base form.

Question 2

Why is the word года only used once at the end of the sentence?

Accepted Answer

When stating a span of years, it is standard in Russian to drop the word for "year" after the first number to avoid repetition. You simply attach года (Genitive singular) after the second year.

Question 3

The branch is closed and its work is completely finished. Why use the imperfective verb работал instead of a perfective verb?

Accepted Answer

Even when an action is entirely in the past, Russian uses the imperfective aspect to emphasize the duration or the ongoing process over a specific span of time. Since we are highlighting the block of time from 2005 to 2010, работал is the right choice.

Question 4

Could we use по instead of до to say "to 2010"?

Accepted Answer

Yes! You can use по followed by the Accusative case (по две тысячи десятый год). Using по strongly emphasizes that the entire year of 2010 is included. Using до with the Genitive means "until," which often implies the operation stopped sometime before 2010 ended.

Мы получили письмо от партнёра, что этот филиал работал с две тысячи пятого до две тысячи десятого года.

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