蓋

1. Origins, structure, and basic meaning

• Structure: 蓋 is a noun read ふた, meaning a lid or cover for a pot, box, or container.
• Basic usage: 蓋を開ける describes opening it, while 蓋には…付いている describes a condition on its surface.
  • 鍋の蓋を少し開けて湯気を逃がした。 describes opening a pot lid slightly to release steam; 箱の蓋には小さな傷が付いている。 says that the box lid has a small scratch.

2. Common pitfalls and similar expressions

• 蓋を開ける
  • を marks the lid being opened.
• 湯気を逃がす
  • The lid is opened slightly so that steam can escape.
• 蓋には傷が付く
  • には presents the lid as the location of the scratch.