4.1: Baskets Help Us. Practices the sound /ə/ represented by the schwa 4.2: Six. Practices the sounds /ks/ represented by the letter "x" 4.3: Gramps and the Twins. Practices the sound /w/ represented by the letter "w" and /z/ represented by -s, -es 4.4: Zig, Zag, Zip. Practices the sound /z/ represented by the letter "z" 4.5: Gavin's Rocket Trip. Practices the sound /v/ represented by the letter "v" 4.6: Fish Wish. Practices the sound /sh/ represented by "sh" 4.7: Chad's Chickens. Practices the sound /ch/ represented by "ch" and -tch 4.8: Let's Guess. Practices contractions