事前

1. Origins, structure, and basic meaning

• Structure: 事前 is read じぜん and means before an event or action.
• Basic usage: It is used for advance arrangements such as registration or sending questions.

2. Common pitfalls and similar expressions

• の and に
  • 事前の申し込み uses の to modify a noun.
  • 事前に送る uses に to indicate when something is sent.
• The reference event
  • 事前 is before an event, while 事後 is after it. 事前 alone does not specify how many days beforehand.