執筆

1. Origins, structure, and basic meaning

• Structure: 執筆 (しっぴつ) is the noun writing or authorship and the stem used in 執筆する.
• Basic usage: 新作を執筆している describes writing now in progress, while 論文の執筆に必要 treats writing a paper as an activity.

2. Common pitfalls and similar expressions

• Progressive 執筆している and nominal 執筆
  • Adding している presents ongoing work; in 論文の執筆, the preceding noun identifies what is being written.