Correct the mistakes:
1. I just wonder whether are you happy.
2. He is asking if they have a nephew or not.
3. They wonder if she sings well or not.
4. Ask him if is it clear.
5. I wonder whether were they well-bred.
6. He wonder whether we are late.
7. She is asking if am I married.
8. I wonder if he is old enough or not.