一人

1. Origins, structure, and basic meaning

• Structure: 一人 is read as ひとり here and expresses either one person or being alone.
• Basic usage: 一人で作る describes acting alone, while 人が一人残る counts the one person who remains.

2. Common pitfalls and similar expressions

• Meaning with で
  • 一人で focuses on doing something without company rather than merely counting a person.
• Position as a quantity
  • In 知らない人が一人, the quantity follows the marked person phrase and states that one such person remains.