He asked where is she.
✅ CorrectHe asked where she was.
She wanted to know what are you doing.
✅ CorrectShe wanted to know what I was doing.
He asked me if I can help.
✅ CorrectHe asked me if I could help.
A1: Yes, you can report yes/no questions by using "if" or "whether".
Q2: What about questions with question words?A2: Questions with question words are reported without changing the question word.