nounA1
理由
why something happens or is done
例文
Please tell me the reason you were late today.
今日あなたが遅れた理由を教えてください。
Do you know the reason why the class was cancelled?
授業がキャンセルになった理由を知っていますか？
There is a good reason to wake up early every day.
毎日早起きするには十分な理由があります。