発展

1. Origins, structure, and basic meaning

• Structure: 発展 (はってん) serves both as the noun development and as the stem of the verb pattern 発展する.
• Basic usage: 町へ発展した describes development into a town, while 研究の発展に役立つ treats development as a noun aided by materials.

2. Common pitfalls and similar expressions

• Verbal 発展した and nominal 発展
  • 発展した reports a completed change; 発展に marks development as the beneficiary of help. Both belong to the same entry.