精通美語(yǔ)語(yǔ)音四:Track31

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Chapter 10: S or Z ?
    The sound of the letter S is [s] only if it follows an unvoiced consonant. Otherwise, it becomes a Z in disguise. When an S follows a vowel, a voiced consonant, or another S, it turns into a [z]. The following exercise will let you hear and practice S with its dual sound. There are many more Z sounds than S sounds.
    Exercise 10-1: when S becomes Z
    Under contrast, in the list that follows, notice how the voiced word is drawn out and then repeat the word after me. Both voiced and unvoiced diphthongs have the underlying structure of the tone shift, or the double stairstep, but the shift is much larger for the voiced ones.
    S Z
    1. price prize
    2. peace peas
    3. place plays
    4. ice eyes
    5. hiss his
    6. close to close
    7. use to use
    8. rice rise
    9. pace pays
    10. lacey lazy
    11. thirsty Thursday
    12. bus buzz
    13. dust does
    14. face phase
    15. Sue zoo
    16. loose lose