YOU SAID:
Have you ever considered not doing that?
INTO JAPANESE
それをしないと考えたことはありますか?
BACK INTO ENGLISH
Have you ever thought you wouldn't do it?
INTO JAPANESE
あなたはそれをしないと思ったことがありますか?
BACK INTO ENGLISH
Have you ever thought you didn't do it?
INTO JAPANESE
あなたはそれをやらなかったと思ったことはありますか?
BACK INTO ENGLISH
Have you ever thought you didn't do it?
That didn't even make that much sense in English.