YOU SAID:

i was walking the dog when a man fell from the roof

INTO JAPANESE

私が犬の散歩をしていたとき、男が屋根から落ちた

BACK INTO ENGLISH

A man fell off the roof while I was walking my dog.

INTO JAPANESE

私が犬の散歩中に男性が屋根から落ちました。

BACK INTO ENGLISH

A man fell off the roof while I was walking my dog.