What is the suffix mentioned in this explanation? Is it the "s"? If the "s" in verbs is pronounced as "z" before vowels, for example, "sees", does the same rule apply to nouns? I mean is the "s" pronounced as "z" in plural nouns if it is preceeded by a vowel?
A: The third person singular suffix of regular verbs and
B: The genitive suffix of the singular form of regular nouns and
C. The plural suffix of regular nouns
are pronounced:
/s/ after unvoiced consonants (except /s/, /ʃ/ and /tʃ/ - hits, Pat's, cups
/z/ after voiced consonants (except /z/, /ʒ/ and /dʒ/) and after vowels - hums, Tom's, cans
and
/ɪz/ after /s/, /z/, /ʃ/, /ʒ/ ,/tʃ/,/dʒ/ - washes, Chris's, ditches.