始まる

1. Origins, structure, and basic meaning

• Structure: 始まる (はじまる) is an intransitive verb for an event or class beginning. It appears as a schedule and as an onset that already occurred.
• Basic usage: A class begins at a fixed time; a game starts after rain stops.

2. Common pitfalls and similar expressions

• Scheduled beginning and beginning triggered by a condition
  • 授業は…始まる states a recurring schedule, whereas 試合が始まった reports a past event. Distinguish it from transitive 始める, which takes an initiator.