YOU SAID:
Why didn't anyone think of this before?
INTO JAPANESE
なぜこの前に、誰も考えなかったか。
BACK INTO ENGLISH
Why didn't anyone ago this?
INTO JAPANESE
なぜ誰も前にこれをしていないか。
BACK INTO ENGLISH
Why didn't anyone ago this?
That didn't even make that much sense in English.