Re: Prepositions ; silly question but help me out!
I would never say that someone forced someone "on" her knees, but rather forced her "to" her knees. A tremendous pressure on your shoulders, or a greatly swaying boat that makes it impossible to stay standing, or a person with a gun who says "Get on your knees!" could all "force you to my knees."
I don't have answer for your original question, but your original sentence is just too unnatural to go without comment.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.