Here are some examples of words with each spelling:
ay
* say
* play
* way
* stay
* day
ai
* rain
* pain
* train
* snail
* wait
ey
* they
* grey
* prey
* obey
* key
ei
* neighbor
* weigh
* eight
* rein
* veil
ie
* tie
* lie
* pie
* die
* high
y
* cry
* fly
* try
* why
* buy
Remember, this is just a small sample! There are many more words with this sound. It's a good idea to look up words in a dictionary or online to see how the "ay" sound is spelled in different contexts.