完了

1. Origins, structure, and basic meaning

• Structure: 完了 (かんりょう) is an event noun, used with する, for a process or task reaching its finished state.
• Basic usage: 点検が完了した predicates all inspections reaching completion by noon, while 支払いの完了 specifies the completed payment confirmed by an email.

2. Common pitfalls and similar expressions

• Completed subject and content of completion
  • In 点検が完了する, the inspections are the が subject; in 支払いの完了, payment before の specifies what was completed. Completion itself is not an agent performing either task.