YOU SAID:
I don't know whether to be happy or sad.
INTO JAPANESE
私は幸せか悲しいか分からない。
BACK INTO ENGLISH
I don't know if I'm happy or sad.
INTO JAPANESE
私は幸せか悲しいのか分からない。
BACK INTO ENGLISH
I don't know if I'm happy or sad.
That didn't even make that much sense in English.