> "probably could not have been"
You know you do have a little problem with the language.
"In actuality they probably COULD NOT have been built with ramps and there are several ways they might have been built."
The referent is the great pyramids. Ramps are specialized inclined planes used by the Egyptians. Since the statement is they probably weren't built wioth ramps I've suggested that there are many ways they might have actually been built.
You have ramps and tombs hardwired into your thinking so a lot of good sentences aren't comprehended or they might blow a fuse.