Tips for the “ai” sound:
“ai” is similar to the “i” in “bike.”
Tips for the “ei” sound:
“ei” is similar to “ey” in the English “hey.”
Tips for the “ao” sound:
“ao” sounds like “cow”. The “a” is much more audible than the “o”.
Tips for the “ou” sound:
“ou” sounds like “oh”, as in “soul”.