Questions & Answers about Odjednom je počela kiša.
Serbian word order is more flexible than English word order. All of these are possible, but they put the focus in different places.
- Odjednom je počela kiša. = emphasis on suddenly
- Kiša je odjednom počela. = emphasis more on the rain
- Kiša je počela odjednom. = possible, but less natural in many contexts
Starting the sentence with odjednom is very common when you want to set the scene: Suddenly, it started to rain.
Odjednom usually means suddenly or all at once.
In this sentence, it tells you that the rain began unexpectedly or abruptly.
A close synonym is iznenada, which also means suddenly.
So Odjednom je počela kiša and Iznenada je počela kiša are very similar.
Je is the 3rd person singular present form of the verb biti (to be), and here it helps form the perfect tense, which is one of the main past tenses in Serbian.
So:
- je počela = started / has started
This is not the verb to be with its usual meaning. It is functioning as an , like English in , though Serbian uses it more broadly for past actions.