YOU SAID:
why did i die yesterday
INTO JAPANESE
なぜ昨日死んだの
BACK INTO ENGLISH
Why did I die yesterday?
INTO JAPANESE
なぜ昨日死んだのですか?
BACK INTO ENGLISH
Why did you die yesterday?
INTO JAPANESE
なぜあなたは昨日死んだのですか?
BACK INTO ENGLISH
Why did you die yesterday?
That didn't even make that much sense in English.