► 代名詞
何故 [なにゆえ] [liter] meaning: why rank: 3
☆ 人は何故に生きるのか ⇨ For what does a human live?
► 副詞
何故 [(1)なぜ] [liter] meaning: why rank: 1
☆ 人間は何故殺し合うのか ⇨ Why do humans kill each other?
☆ 何故そう思うのですか？ ⇨ Why do you think so?
► 接続詞
何故なら [(1)なぜなら] [liter] meaning: because rank: 3
☆ 人間はいつかは死ぬ。何故なら人間は生物だからだ ⇨ Humans will eventually die. That’s because humans are living organisms
何故ならば [(1)なぜならば] [liter] meaning: because rank: 4
☆ 人間はいつかは死ぬ。何故ならば人間は生物だからだ ⇨ Humans will eventually die. That’s because humans are living organisms