You have to give them something that they're interested in before they will willingly write. That requires really knowing your child; you have to observe what they do of their own accord.
Sorry, it's harder than that. I could give him a subject that fascinated him and it would be "Why are you ruining this for me by making me write about it?" Every now and then we'd hit on something but never anything to run with.
He has organizational problems and I'd help him by giving him a framework sometimes, and I tried to teach him how to come up with his own frameworks, but it wasn't something he was ready for.
Mrs VS