YOU SAID:
Do you know where my hat is?
INTO JAPANESE
私の帽子はどこにあるか知っていますか?
BACK INTO ENGLISH
Where do you know whether there is my hat?
INTO JAPANESE
どこで私の帽子があるかどうかを知っているのですか?
BACK INTO ENGLISH
Where do you know whether or not there is my hat?
INTO JAPANESE
どこで私の帽子があるかどうかを知っていますか?
BACK INTO ENGLISH
Where do you know whether or not there is my hat?
Come on, you can do better than that.