Abstract: A method to teach a language may include the steps of selecting a predetermined letter sound to be evaluated, providing a first predetermined word which exhibits the predetermined letter sound, adding a first predetermined diacritic character to the first predetermined word and generating a predetermined word deleting the letters having the first predetermined diacritic character. The predetermined letter sound may be a short vowel, and the predetermined letter sound may be a long vowel. The predetermined letter sound may a long I, the predetermined letter sound may be a closed A. The predetermined letter sound may be a closed O, and the predetermined letter sound may be a vowel pronounced as a schwa. The predetermined letter sound may be the letter O, and the predetermined letter sound may be an alternate consonant. The predetermined letter sound may be a silent letter.