Spelling

John needed some help while doing his homework this week.

John: Mom, how do you spell c,h?
Me: c, h
John: Yea, how do you spell c,h?
Me: c, h
John: You know, it makes the "ch" sound? How do you spell c, h?
Me: John, you spell it with a c and an h.
John: Oh, yea, thanks.