YOU SAID:

My dog has eaten my biology homework while is was in the bathroom.

INTO JAPANESE

私の犬はトイレにいた間に私の生物学の宿題を食べました。

BACK INTO ENGLISH

My dog ​​ate my biological homework while I was in the toilet.

INTO JAPANESE

私の犬は私がトイレにいる間、私の生物学的な宿題を食べました。

BACK INTO ENGLISH

My dog ​​ate my biological homework while I was in the toilet.