remain

1. Origins, structure, and basic meaning

• Structure: 残 has 10 strokes and conveys remaining or leaving something behind.
• Basic usage: 残る is read のこる, and 残す is read のこす.

2. Common pitfalls and similar expressions

• Something remaining and someone leaving it
  • ケーキが一切れだけ残っている means that only one piece of cake remains.
  • ケーキを一つ残した means that someone left one cake or portion of cake.
  • が marks what remains, while を marks what someone left.
• Memories in the heart and in photographs
  • 心に残る means to remain in one's heart.
  • 思い出を写真に残す means to preserve memories in photographs.