This may seem simple to most people, but it's not. Many children who struggle with reading need some help and practice hearing the separate sounds in words. Being able to hear and say separate sounds in words in called phonemic awareness. Each sound is called a phoneme. The written representation in called a grapheme. Here's an extremely useful list of phonemes and the letter representations of each phoneme. I recommend you make a copy of this list and use it as a resource.
Reading Rockets has some phoneme awareness activities you may want to try.
