The English plural morpheme or marker is the letter –S.
It has three sound variants -/s/,/z/ and /ɪz/. It’s important to know when the plural marker –S makes this different sounds in words.
/s/ is the voiceless sound of the plural marker –S. And so, the plural marker –S is realized as /s/ when its follows voiceless consonants such as /k/, /p/,/t/,/f/,/θ/ etc
You pronounce the plural marker –S as /s/ in the following words:
/z/ is the voiced sound of the plural marker –S. When the plural marker –S is after a voiced consonant such as /d/,/g/,/v/,/l/,/b/ etc its realized as /z/.
Pronounce the plural marker- S as /z/ in the following words:
The plural marker –S is also realized as /z/ when it follows a vowel at the end of a word.
Pronounce the plural marker-S as /z/ in the following words:
The plural marker – S is realized as /ɪz/ when it follows consonant /tS/,/ʤ/ and /s/.
Pronounce the plural marker –S as /ɪz/ in the following words: