YOU SAID:

A bird's wing fell from the sky, and I wondered where it had come from.

INTO JAPANESE

鳥の羽が空から落ちて、どこから来たのだろうと思いました。

BACK INTO ENGLISH

The bird wings fell from the sky and wondered where they came from.

INTO JAPANESE

鳥の羽は空から落ちて、どこから来たのかと思いました。

BACK INTO ENGLISH

The bird wings fell from the sky and wondered where they came from.