換わる

1. Origins, structure, and basic meaning

• Structure: Written 換わる and read かわる, it is an intransitive verb for one item or value being exchanged into another equivalent form.
• Basic usage: It describes coins turning into a banknote and collected points becoming store vouchers.

2. Common pitfalls and similar expressions

• Exchange rather than general change
  • The transformation follows an exchange relationship or equivalent value, not merely any alteration.