godan verb (-ru), intransitive verb
Intransitive: the event, class, meeting, season, story, etc. is what starts. For starting something deliberately, use the transitive 始める.
授業は九時に始まる。
Class starts at nine.
会議が予定
The meeting started as scheduled.
godan verb (-ru), intransitive verb
start up again; begin again; happen again
Often used with また or いつもの for something recurring that starts again; it can carry a mildly annoyed or resigned tone depending on context.
またいつもの口論が始まった。
The usual argument started up again.
godan verb (-ru), intransitive verb
date from; originate in; have its beginnings in
Used in explanatory contexts to say when or where a custom, institution, history, or practice began; often appears with に or から.
この祭りは江戸時代に始まるとされる。
This festival is said to date from the Edo period.