forget

1. Origins, structure, and basic meaning

• Structure: 忘 has 7 strokes, the on-reading ぼう, and the kun-reading わすれる. 忘れる (わすれる) means to forget or leave something behind.
• Basic usage: 忘れる describes forgetting; 忘れ物 (わすれもの) names an item forgotten or left behind.

2. Common pitfalls and similar expressions

• Forgetting something and leaving an object behind
  • 傘を電車に忘れてしまった means accidentally left an umbrella on the train. 感謝の気持ちを忘れないでいたい expresses a wish not to forget to be grateful.
  • 忘れ物がないか is used when checking for anything left behind. 忘れ物の傘 refers to an umbrella someone forgot.