1. The book was so boring that I stopped ...
It was such a boring book that I stopped....
2. The novel has many funny characters, so both young and old love it.
There are many funny characters in the novel, so both young and old love it.
3. The book has a lot of violence, so many people will refuse to read.
There is a lot of violence in the book, so many ....
4. The book was so interesting that I could not put it down.
It was an interesting book that I could not put it down.