Children need to really know the different representations of the vowel digraphs to be able to read them automatically. This is one way to help children do that.
One of the children I work with knows all these sounds but doesn't recognise them in words.
The idea is for the child to really look at the words, read them and highlight them in different colours. This really focuses them into the sounds they are searching for.
Download ay/ai/a-e search