Syntax questions (using X-Bar theory)

I'm trying to write about verb raising in Spanish, and realized I don't really understand some of the basics of verb raising. In a language like Spanish where all verbs are inflected with person, do all verbs raise? Or do only verbs with tense inflections raise? (like the Spanish pasts and future). How do you prove that verbs raise in a language like this? My book gives some examples from French about adverb position, but I don't really understand them. What about verb raising when you have haber as an auxilary? Where the heck would your participle go on a tree?


Thanks!