When he says he's "pretending" explain to him the difference. Believe me, I have heard the "pretending" excuse from my kids. I just said "Pretending is when you're playing and you act like you are spiderman. Lying is when you say you made your bed when you did not make it." Then, I told them that lying is not accepted and they would have to get a spanking. He is old enough to understand the difference, you may just have to enforce consequences in order for him to follow the rules for it.
Also, Amy, you may want to reconsider allowing your son to get away with lying when you KNOW he's lying. You're teaching him that he's able to get away with not telling you the thruth! The point of enforcing consequences is to make your child be easily able to choose his actions BEFORE he makes bad choices. If your child has endured consequences for lying before, they will think twice before trying to do it again because they will know the last time they lied they got in big trouble. But, if you're allowing him to get away with it, when you know he's doing it, then you're also teaching him that sometimes he can get away with not being honest with you, and boy will that suck for him to think when he becomes a teenager!! When I knew my kids were lying, and they were reluctant to tell me, or were flat out NOT telling me, I would at first give them a chance, and then if I realized they weren't coming clean, I would tell them "I'm very disappointed in you because you have made the choice to not tell me the truth. If you had told me the truth, I would've considered not punishing you very badly, but now that you have chosen to NOT tell me, you will be punished worse." Just ignoring the fact a child is lying only TEACHES them to LIE. Definitely don't take that route, R.!!
Just commenting on the comment the woman made about how it "seems like Julie's children are afraid of getting in trouble" Does this statement not represent EXACTLY what we are trying to teach our children as parents???? Thank you to whoever said that because I'm sitting here applauding myself!!!! I am not trying to get all religious on everyone here, but God says he WANTS us to fear him. Children are SUPPOSED to fear getting in trouble! Why else would they make the choice to not do things they aren't supposed to?? Because of guilt?? Give me a break. This board is getting pretty liberal, maybe from the upcoming elections, but come on people. Discipline your kids so that our kids aren't subjected to all that bad behavior all the time........