Are you teaching a child to read? Are you using those old fashioned flash cards? My Nephew had problems with them because he was learning sounds and couldn't get the beginning sound of the picture.
I thought about this and came up with a solution. I thought about the skills a 5 year old has. They could recognize things that are the same and different. I created my book with the alphabet and 2 pictures for each letter. The child looks at the 2 pictures, say the sound they both have and that is the sound of the letter. Finally, a answer to this problem.
See book video: (cut and Paste)
https://www.youtube.com/watch?v=tJrmha9LHBQ