〜さえ

1. Origins, structure, and basic meaning

• Structure: さえ emphasizes extent by singling out something especially unexpected or minimally expected in that situation.
• Basic usage: 彼はひらがなさえ読めなかった。 emphasizes limited reading ability through the inability to read even relatively basic hiragana.

2. Common pitfalls and similar expressions

• The extreme example depends on context
  • 時間さえなかった emphasizes not having even a minimal amount of time, while 先生さえ間違えた highlights a mistake by a teacher who was expected not to make one. Context determines what is unexpected.
• Separate negation from a condition
  • さえ is not itself negative and also occurs in affirmative sentences such as 先生さえ間違えた. 時間さえあればできる sets having time as a sufficient condition, unlike the simple emphasis in 時間さえなかった.