The schwa sound /a/ sound is a short and lax vovel.( try this excercise ) To produced the /a/, the lips are slightly parted and there is no tension at all while the tongue lies relaxed on the floor of the mouth. its sides and its tip do not touch any part of the mouth. ok try to read some sentences.and see the unstressed positions. I sit down infront of the computer and I am mesmerzed. I hate to think. I call up a friend. I'm into the middle of the program. for many teenagers , computer is an easy way out. There's murder in some parts of washington. Turn to international news and theres killing in Syria. see....how the Schwa sounds works.... did you feel it?