Thanks for you replies.
Well, yes, actually "The paper" is the subject of the sentence, but that is syntactically speaking. What I want to know is which
semantic value "The paper" has in that sentence.
I think that "The paper" may be the Patient. I've been reading some information these days and I came across with this:
"Patient is the semantic role of an entity that is not the agent but is directly involved in or affected by the happening denoted by the verb in the clause".
Maybe that's it, what do you think?