Well cherry there's a difference between the apple being yours and you having one. Having it implies ownership but doesn't necessarily mean that you actually do own it. Like, I could be borrowing a friends car and could say "I have this car", that doesn't mean it's mine but I still have it, albeit temporarily.
I've been using duolingo to learn french for almost a year at this point, it's good but I use http://french.about.com/od/vocabulary/ a little to help reinforce certain things or just help when I need clarification. I'm nowhere near bilingual though.