За

А versatile preposition, it's usage in Russian with examples and exceptions

The preposition "за" in Russian language has more than one meaning and can be used in different contexts.

1. Indicating Location or Position (Behind, Beyond)

«Солнце скрылось за горою» А. Коваленков (The sun has hidden itself behind the mountain.)

“За морем житьё не худо…” А. С. Пушкин (Life is not bad beyond the sea.)

2. Indicating Time (During, In a Certain Time Period)

За час до встречи он позвонил мне. (He called me an hour before the meeting.)

Мы закончили проект за неделю. (We finished the project in a week.)