Usage of "was having fun"

[Liza]

Hi,

Could you tell me which is correct?

1. I was having fun while I read the book.
2. I was having fun while I was reading the book.
3. I had fun while I was reading the book.
4. I had fun while I read the book.

Thanks a lot.
Liza

[Diverhank]

None of the sentences sounds natural to me. If I had to write it, I'd use "I had fun reading the book" or "I enjoyed reading it"