I have had a similar experience with a younger student age 6. I too was surprised at how easy it was to get a Yes response! I always thought I had to have a yes and no response. This is my first student who has severe physical disabilities so was at a loss as to what I should do. I have to tell you these daily lessons made a difference. Her yes response was like the first comment she looks up. At first it was a little slow as I was not reading her response immediately but as soon as I got it we were able to fly. I am having so much fun having conversations with her and her teacher is excited too! I am getting ready to share this with home. What surprised most is how quickly she was able to communicate with me. I also thought I would have to teach her every page and the symbols on it but I found that I can just show her once what is on the pages and she is able to communicate!