金曜日

1. Origins, structure, and basic meaning

• Structure: The spelling is 金曜日, read きんようび, and it combines 金曜, meaning Friday, with 日, meaning day.
• Basic usage: 金曜日 is Friday, the day after Thursday and before Saturday, and it can locate an event or set a deadline.

2. Common pitfalls and similar expressions

• A scheduled day and a completion deadline
  • Both examples use the form 金曜日. With に it marks when the dental visit occurs; with までに it marks the deadline by which the homework must be submitted.
• A Friday afternoon appointment and this week's due date
  • 金曜日の午後に歯医者へ行きます。 — I am going to the dentist on Friday afternoon.
  • 今週の金曜日までに宿題を出してください。 — Please submit your homework by this Friday.