 Re: on
By the choice of preposition you create the context - language makes no sense out of context.
If you say There's an alien... on John's book I understand that a real alien is standing or sitting on John's book. Fine if the context is a science fiction film and the sentence is spoken by someone who has just seen the alien (or in real life if Star Trek got the date of the First Contact wrong....)
If, on the other hand, the context is that you're describing one of the book's characters, then the sentence must be There's an alien... in John's book. |