This interactive PowerPoint introduces/reviews the vowel diphthongs of oy and oi. The students will need their whiteboards or paper. The first set of slides go over the sound that oy/oi make. The students then practice spelling words with the oi sound that appear on the screen. Then, they do the same with the oy sound. There is one slide where the students practice spelling the words but they are mixed up. The PowerPoint also has the students get active! There are a few slides where the students must decide which word is spelled correctly. They show their answer by doing exercises!