We looked a little bit at the format of a persuasive writing piece as well. Using my favourite meal as an example, the students learned that their piece must include an introduction, 3 reasons and a conclusion. They were then asked to write their own piece about their favourite meal. They worked really well and I thought they did great for their first try!
PS, I apologize in advance if you find your child is trying to convince you to let them do things as I did ask them to practice at home!