1. I'd like to know if it is necessary to use always onto instead of on when the sentence implies a movement: "He fell onto the ground heavily". "He fell on the ground heavily". the same as it's common to do with into : "He got into the house". "He got in the house" (doesn't sound proper enough to me). "He's in the house". (sounds good because it doen's imply movement). 2. Is this sentence more correct: "There upon the rainbow..." than: "There on the rainbow..."? 3. What does "unto" mean?