都内

1. Origins, structure, and basic meaning

• Structure: The written form is 都内, read とない. An element for Tokyo Metropolis combines with one for inside to mean within Tokyo.
• Basic usage: 都内の会社 locates a company within Tokyo, while 都内で開かれる limits the exhibition venue to somewhere in Tokyo.

2. Common pitfalls and similar expressions

• A commuting destination
  • The company reached by train is somewhere in Tokyo, without narrowing it to a particular ward or city. Example: 彼女は都内の会社へ電車で通っている。 — She commutes by train to a company in Tokyo.
• Event location
  • The exhibition is located within Tokyo, but no more specific venue is given. Example: 都内で開かれる展示会に参加する予定だ。 — I plan to attend an exhibition held in Tokyo.