替わる

1. Origins, structure, and basic meaning

• Structure: 替わる(かわる) describes one person or thing taking the place of another, as with a person in charge or a turn on duty.
• Basic usage: It states that a new employee will take over as the person in charge next month.
  • 来月から担当者が新人に替わる。

2. Common pitfalls and similar expressions

• Replacement and change
  • 担当者が替わる means that a different person takes over. 予定が変わる describes a change in plans, using 変わる for the change itself.
• Being replaced and replacing
  • 当番が替わる describes a change of the person on duty, while 当番を替える describes someone making that change.