These 8 charts present all of the spellings of each of the sounds of English arranged so that all the spellings of a given sound are in the same column.  It can immediately be seen, for example, that  - there are only 3 ways to spell "oy" but 12 to spell "you". The learners, not the teacher, use these charts to point to the spellings of different words and learn from experience, not from memorization, to choose for example "i" in the middle of words and "y" at the end.