YOU SAID:
Oh nuts I did not do my math homework!
INTO JAPANESE
おお、私は数学の宿題をしなかった!
BACK INTO ENGLISH
Oh, I did not do math homework!
INTO JAPANESE
ああ、私は数学の宿題をしませんでした!
BACK INTO ENGLISH
Oh, I did not do math homework!
Well done, yes, well done!