Pronunciation of /s/, /z / and /iz/

-The rule of pronouncing the final /s/,/z/ and /iz/ is :

For /s/: words which ends with these letters : k, p , t, f , th and ph

are pronounced as /s/. For example: audits, groups, works ,

myths ...

For /z/ : words which ends with these letters : r, m ,n , b , d , g , l

, V and y are pronounced as /z/. For example: employees,

supporters, problems, relations , words , deals ...

For /iz/: words which ends with these letters : c, s , x , z, ss, ch ,sh

and ge are pronounced as /iz/. For example: changes,

businesses, boxes , watches ...