I went back to read this thread, it's actually quite informative and I think I've got most of it sorted out concerning "lay down and "lie" down. You "lie" down to have a rest, and he "lay" down to have a rest - or should that be he "laid" down to have a rest? No, I think it is: He "laid" the blanket on the bed, or he "laid" the table.

Now, if you lie to someone about something (not telling the truth), is it: "He lied to you" in past tense? And... he will never "lie" to you?