Breakdown of Иногда туман быстро исчезает.
Questions & Answers about Иногда туман быстро исчезает.
Russian does not use articles (a, an, the) at all.
So туман can mean fog, a fog, or the fog, depending only on context, not on any special word.
In this sentence, туман simply means “(the) fog” in a general or situational sense.
Туман is in the nominative singular case.
- The nominative case is used for the subject of the sentence.
- Here, туман is the thing that исчезает (“disappears”), so it must be nominative: туман (not тумана, туману, etc.).