A child may be able to recite the alphabet, but they need to first learn SOUNDS. Most of reading problems come from a lack of phonemic awareness (knowledge of sounds). When teaching this skill you would not introduce letters yet. Sounds first! There are many ways to do that. The following items will help you. Phonics (combining letters and sounds would come once a student knows sounds.
Here is a Powtoon on Phonemic Awareness:
Another rhyming game