Question 1

Why does изоляции end in -ии rather than -ие here?

Accepted Answer

Even though it is in the prepositional case (triggered by в), feminine nouns ending in -ия in the nominative (like изоляция) take an -и ending instead of the standard -е. This is a common rule that is easy to forget when writing.

Question 2

How is the noun смотритель formed?

Accepted Answer

It comes from the verb смотреть (to watch or look) combined with the suffix -тель. This suffix is heavily used in Russian to form nouns denoting a person's profession, role, or an agent doing an action, much like "-er" in English. Here, it gives us a watcher or keeper.

Question 3

Does the stress on маяка fall on the stem or the ending?

Accepted Answer

The stress falls on the ending: маяка́. The noun мая́к (lighthouse) has fixed end-stress throughout all of its declensions (for example, маяку́, маяко́м).

Question 4

Could I use a word like абсолютный or совершенный instead of полный here?

Accepted Answer

You could, but полная изоляция is the most natural, standard collocation in Russian for "complete isolation." The adjective полный (full) is very frequently used to mean "total" or "complete" when describing abstract states, as in полная тишина (complete silence) or полный порядок (complete order).

Смотритель маяка работает в полной изоляции.

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