This worksheet focuses on minimal pairs with prevocalic /r/ words, including a full range of vowel sounds. Appropriate for older students.
This exercise works well as a progress-measuring tool, and a way for students to self-evaluate and/or participate in joint evaluation with the therapist. You may also choose to begin by rating the student's production yourself, and gradually transition to self-evaluation over multiple sessions. The student may benefit from listening to recordings of his or productions. You can continue to use this self-rating sheet as you move from single word production to words in sentence and paragraph contexts.
Please leave feedback and let me know if this product worked for you. I would be happy to expand to other sounds or other rhotic positions.