The document outlines the pronunciation rules for adding the -(e)s suffix to pluralize nouns and the 3rd person singular present tense form of verbs in English. It explains that the suffix is pronounced /s/ when the word ends in a voiceless consonant, /z/ when the word ends in a vowel or voiced consonant, and /Iz/ when the word ends in /s/, /z/, /ʃ/, /tʃ/ or /dʒ/. Examples are provided for each rule.