How to say “Was the roof covering flammable? That would explain how quickly the fire spread.” in Japanese
In Japanese
屋根の材料って燃えやすかったの?それなら、あんなに一気に燃え広がったのも納得だね。
Yane no zairyō tte moeyasukatta no? Sore nara, anna ni ikki ni moehirogatta no mo nattoku da ne.