You've had the talks, and your child can repeat the rules. That was a sensible place to start. Knowing a rule and doing it are two different things, so every lesson ends in practice.
What you're working toward is letting go a little, on purpose.
You read each lesson, think it through, and plan where to try it. Then you run it with your child. A lesson takes a couple of minutes. Run two or three a week. One question in the car, the words to say, then a try somewhere real, like the store or the park. There's a pocket tip for every lesson, short enough for your child to say back to you.
Nothing in the book tests your child without telling them. They always know it's practice. In every workbook story, the child has an adult close by.