YOU SAID:

if the shoe fit, why did it fall off in the first place

INTO JAPANESE

靴がフィットすれば、なぜそれが最初に落ちたのですか？

BACK INTO ENGLISH

If the shoes fit, why did it first fell?

INTO JAPANESE

靴がぴったり合ったら、どうして最初に落ちましたか？

BACK INTO ENGLISH

If the shoes fit perfectly, why did it fall first?

INTO JAPANESE

靴が完璧にフィットする場合、なぜそれが最初に落ちたのですか？

BACK INTO ENGLISH

If the shoes fit perfectly, why did it fall first?