How to say “Someone stuck gum under the teacher's desk, and now the whole class has to stay behind until he finds out who.” in Japanese
In Japanese
誰かが教卓の裏にガムをくっつけたせいで、犯人がわかるまでクラス全員が居残りになった。
Dareka ga kyōtaku no ura ni gamu o kukkutsuketa sei de, han'nin ga wakaru made kurasu zen'in ga inokori ni natta.