This is the 121st most frequent Finnish word.
alkoi
"Alkoi" means "began" or "started" in English.
Here, 'alkoi' indicates the beginning of the rain, providing temporal information about when it started.
Sade alkoi yhtäkkiä.
The rain started suddenly.
In this context, 'alkoi' is used to describe the starting time of an event, emphasizing the scheduled initiation.
Teatteriesitys alkoi kuudelta illalla.
The theater performance started at six in the evening.
The word 'alkoi' is used in this sentence as the past tense form of the verb 'alkaa' meaning 'to start' or 'to begin', showing the initiation of an action.