ESL Students have a hard time learning vowels and the difference between name and sound aka long and short vowels. Pictures for E, A, and U are easy because most students know what an apple, elephant, and umbrella are. More challenging vowels are O and I because there are not many words that have easy pictures. Using lower level words in sentences that they can associate with the vowel. Some might say ostrich for O but most ESL kids have no idea what that is so using a light switch with On and O