concepts: cardboard fold piece shirt
target: The boy folds a piece of cardboard and places it inside his shirt.
references: The boy folds a piece of cardboard and places it inside his shirt. A teacher folds a piece of cardboard against her shirt for special demonstration. I will make a house out of cardboard.  The boy will fold his laundry. A piece of cake is on the plate. The lady's shirt is red. Fold this piece of cardboard to fit inside the shirt. Dude is folding his shirt with a piece of cardboard.