This app gives you an explanation of the correct movement of the language to produce the R sound, as well as several images to practice the articulation of the R phoneme in words.
Practice the articulation of the R phoneme in all positions of the word, where it appears in the Portuguese language.
In the starting position you can learn to say RAT ... in the medial position CAR ...
Happies also offers you the option of filming while training to monitor your progress or send it to your speech therapist.