Puedo tener... (pweh-doh-teh-nehr) May I have?:
Use "Spanglish" to practice colors and other adjectives-
Puedo tener the ball rojo...
Puedo tener the shirt grande....
This method will allow you to see how many adjectives your child has actually absorbed in long term memory, and not just to fill in the pages of his Flip Flop Spanish Workbook.