Is the reason why you don't drive because public transportation is so accessible?
ーIs the reason why you don't drive because public transportation is so accessible?
「あなたが車に乗らないのは、公共交通機関の利便が良いからかな?」
Is the reason why you don't ... because ~? で「あなたが…しないのは〜だからなのかな?」と表現できます。
ーI wonder if the reason why he doesn't eat pork is because of his religion.
「彼が豚肉を食べないのは宗教が理由かな」
I wonder if the reason why he doesn't ... is because of ~. で「彼が…しないのは〜が理由かな」を表現できます。
ご参考まで!