I have been designing resources for many years as I worked with preschool and primary age youngsters with delayed or impaired speech and language skills. The resources using symbols are free. My latest resources which I have illustrated are extra tasks based on Marion Blank's Language Levels (previous ones have been free). They can be used with groups of mixed language ability and are reasonably priced.
Information presented in visual form using Widgit and PCS symbols. Includes guide for adults. Practice with asking and answering questions using a clear visual format. Worksheets require KS1 reading skills to match questions and answers about the pictures. Additional sheet added to use the practice with the pictures provided before - apply to any suitable pictures from anywhere!