In speech therapy, they are currently working on having Zavier answer more complicated questions. Example: "Zavier, who gave the yellow flower to Buddy Bear?" and he'd have to answer, "The mouse" with the hope that he would be able to finally answer in a more complete sentence: "The mouse gave the yellow flower to Buddy Bear."
They use a Buddy Bear set from Linguisystems. Let me try to find the materials online:
Hopefully the link works.