After your client or child has learned to produce a successful "t" and "d" sound, help him form a successful "s" and "z" sound with this technique. Show the child a picture of a butterfly to get an idea of what you are trying to teach. You may even give him a butterfly handout to take home and color. Next, tell him to shape his tongue by imagining a butterfly with the sides of the wings on the top teeth and the middle of the tongue being the body of the butterfly. The middle of the tongue should hang a little bit so that there is some air space. Ask the child to then try to produce an "s" and "z" sound.
Assemble various pictures of things whose names have sounds you are working on in them. You can download these off of the Internet or you or the child can draw them or gather them yourself. Use them as flash cards and ask the child to pronounce what it is she is seeing. Group your pictures into specific sounds at first. When the child has become more advanced, try mixing the sounds up.
Purchase a set of cards for the game "Memory" or make your own using your own drawings or flash cards. Make sure there are two of everything. Place the cards face down on the table. Each player will turn one card over and then try to find its match. When he finds the match, he takes both cards out. If no match is found, both cards are turned back over and remain in the game. The player with the most matches at the end wins. Use pictures of words with sounds you are targeting. Ask the children to say each word as they turn the cards over.