YOU SAID:
I did not do what you said I might do back then
INTO JAPANESE
あなたが言ったことを私がやったことはありませんでした。
BACK INTO ENGLISH
I never did what you said.
INTO JAPANESE
あなたが言ったことは決してしなかった。
BACK INTO ENGLISH
I never did what you said.
That didn't even make that much sense in English.