問題

1. Origins, structure, and basic meaning

• Structure: 問題 is read as もんだい and is a broad noun for a problem requiring solution, a test question, or an issue that may cause difficulty.
• Basic usage: Use 難しい問題 for something to solve or consider and the fixed expression 問題ない for no difficulty or issue.

2. Common pitfalls and similar expressions

• Difference from 質問
  • 質問 is a question asked of someone; 問題 can be an exercise, difficulty, or social issue to be addressed.
• Function of 問題ない
  • Beyond literal absence of a problem, it commonly judges a plan, schedule, or quality to be acceptable.