In the movie Time Machine, Guy Pearce's fiance keeps dying when her time comes, no matter how many time he travels back to meet her.
My question is why can't he take her on his time machine and take her past her death time so that she can survive?
The Über-Morlock explains that Alexander cannot alter Emma's fate because her death is what drove him to build the time machine in the first place: saving her would create a temporal paradox. He then reveals that the Morlocks have brought the time machine underground, and tells Alexander to get into it and return home
He simply didn't think of the solution, which would have been to go back in time and fake her death but in actuality transport her to the future at any point after he had undertaken this specific time journey. In this scenario, there would be no paradox since his pre-time machine self would have still built the machine in order to save her.