Each time, we change cards , each person must read and practice his card. Some items don't change in the same way, e.g. my room, your room . The use of the pronoun changes, but the ownership is not transferable in the same way that jump and turn are interchangeable. If you are present , I can use your but if you are absent, I must use his or her. Once your child understands the concept with people, practice the structures using a room full of stuffed toys or action figures.
Repetition is important to reinforce correct use of the structures .
Q. I think our son has apraxia. When he responds to our requests to say certain words, he sometimes gets a burst of non-related sounds. I have tried the pacing board, but that takes lots of tries. Since I do not know your son, I do not have a complete picture of his speech. Having difficulty turning off a sequence of sounds, reversing sounds, and having difficulty with imitating sounds and words are some symptoms of motor planning problems known as developmental apraxia of speech.