Questions & Answers about Система уже работает.
Russian does not have articles, so there is no separate word for the or a/an.
So система can mean:
- the system
- a system
Which one you choose in English depends on context. In an isolated sentence like this, the system is often the most natural translation.
Система is in the nominative singular form because it is the subject of the sentence, the thing doing the action.
Basic breakdown:
- система = subject, system
- уже = already
- работает = works / is working / is operating
Because система is the subject, it stays in the dictionary form here.