場合

1. Origins, structure, and basic meaning

• Structure: 場合 is read as ばあい and means a case, situation, or circumstance under a stated condition.
• Basic usage: It can introduce what to do if one is late or identify the best choice in the situation at hand.

2. Common pitfalls and similar expressions

• Introducing a condition
  • 遅れる場合 presents being late as the condition under which the instruction applies. Example: 遅れる場合は事前に連絡してください。
• Referring to the present case
  • この場合 points to the specific situation currently under discussion. Example: この場合、別の道を選ぶほうが早いです。