You know "I" you know "E" let's meet "IE"
You know "O", you know "A", let's meet "OA"
We know now the sount "A" and the sound "I". Let's meet the sound "AI"
https://www.youtube.com/watch?v=Hh2_Qs7dGDw
https://www.youtube.com/watch?v=LPJi_ZzyRdA
https://www.youtube.com/watch?v=uOESY42bu0Q&t=22s
https://www.youtube.com/watch?v=6rGbQkKTb7A
https://www.youtube.com/watch?v=4MUJPxCJEuI
https://www.youtube.com/watch?v=bfnMdeKJThM
https://www.youtube.com/watch?v=7TLBk0OxOqc