記憶

1. Origins, structure, and basic meaning

• Structure: 記憶, read きおく, serves as the noun memory and as the stem of 記憶する, to remember.
• Basic usage: 旅行の記憶がよみがえる refers to a memory returning, while 道順を記憶していた describes having retained a route.

2. Common pitfalls and similar expressions

• Noun 記憶 and verbal 記憶していた
  • With がよみがえる the memory itself resurfaces; 記憶していた predicates a continuing remembered state of a person.