YOU SAID:
Where has everybody gone?
INTO JAPANESE
みんなはどこへ行ってしまったの?
BACK INTO ENGLISH
Where have they all gone?
INTO JAPANESE
彼らはどこへ行ってしまったのでしょうか?
BACK INTO ENGLISH
where have they gone?
INTO JAPANESE
彼らはどこへ行ったのですか?
BACK INTO ENGLISH
where did they go?
INTO JAPANESE
彼らはどこに行きましたか?
BACK INTO ENGLISH
where did they go
INTO JAPANESE
彼らはどこに行きましたか
BACK INTO ENGLISH
where did they go
That didn't even make that much sense in English.