良い

1. Origins, structure, and basic meaning

• Structure: 良い (よい) is an inflecting adjective that positively evaluates a condition or an achievement.
• Basic usage: 天気が良い predicates a favorable condition of the weather, whereas 良い仕事 modifies a noun and evaluates the quality of work for the community.

2. Common pitfalls and similar expressions

• Predicative and attributive functions
  • The form is 良い in both places, but 天気が良い is predicative and 良い仕事 is attributive. The stronger gloss “excellent” should not be forced onto the weather example.