Teach letters and sounds simultaneously. For example, "this is the letter T and it sounds like "t". REMEMBER, the sound is NOT the letter! The letter T is pronounced like "tea". The sound is /t/ and is made by placing the tongue up behind the front teeth and releasing with air but no sound.
Try associating the letter sounds something familiar. For example, the letter sound /s/ is easily associated with the hissing sound of a snake— sssssss.
Set up four letter sounds on different audible switches (or on one multi message device). Sing to the tune of Old McDonald Had a Farm...
Old McDonald goes to school- eieio
and in that school he has a T (say the letter)- eieio
with a /t/ - /t/- here and a /t/ - /t/ - there (use the switch to verbalize the sound)
You should model pressing the switch before asking the student to do it.
Generate a list of words that begin with the target sound and have the words respresented by either pictures or the written word. Develop a pattern sentence and let the student choose the word to complete it. For example, if the target sound is /b/, then use a Birthday Story: