掲示

1. Origins, structure, and basic meaning

• Structure: 掲示 (けいじ) is an action noun, used with する, for putting information where people can see it.
• Basic usage: お知らせを掲示した actively posts a closure notice at the entrance, while 掲示された規則 is a passive relative clause modifying rules already displayed.

2. Common pitfalls and similar expressions

• Active object and passive modifier
  • With 掲示した, the notice is the を object; in 掲示された規則, the rules are what received the posting action. The passive rules are not the agent that posted something.