通常

1. Origins, structure, and basic meaning

• Structure: 通常 is read as つうじょう and means “normally” and “usual”.
• Basic usage: It marks the library’s normal closing time and contrasts it with an unusual entrance used during inspection.

2. Common pitfalls and similar expressions

• 通常、六時に閉まる / 通常とは違う
  • Use 通常、六時に閉まる for the norm and 通常とは違う to contrast an exception with it.