- David wants to bring Jack some books.
- David wants Jack to bring some books.
I cannot understand the meanings of these sentences. What do they mean? Are both same?
means that David wants to bring some books to Jack, i.e. David will be the one bringing the books.
means that David wants that Jack will be the one that brings the books (it isn't specified where to).
So both sentences mean something completely different - word order is very important to distinguish between the direct and indirect object as English has no declensions for this purpose like some other languages do.