YOU SAID:
My sister is crying for a stupid reason and I do not know why
INTO JAPANESE
姉が愚かな理由で泣いていて理由がわからない
BACK INTO ENGLISH
My sister is crying for a stupid reason and I don't know why
INTO JAPANESE
姉が愚かな理由で泣いていて理由がわからない
BACK INTO ENGLISH
My sister is crying for a stupid reason and I don't know why
You've done this before, haven't you.