Although the morphological suffix for third person singular verbs in the simple present tense is -s or -es, the suffix is pronounced differently depending on the sound of the last syllable of the verb.
If the last syllable of the verb is a voiceless sound, then the suffix is pronounced as an unvoiced s /s/. Voiceless sounds are produced by not vibrating the larynx, or voice box, in the throat. The voiceless, or unvoiced, sounds in English are:
For example:
- breaks /breɪks/
- coughs /kɒfs/
- drinks /drɪŋks/
- hopes /həʊps/
- sits /sɪts/
If the last syllable of the verb is a voiced sound (except for those in the next group), then the suffix is pronounced as a voiced z [z]. Voiced sounds are produced by vibrating the larynx, or voice box, in the throat. The voiced sounds in English are:
/l, b,d,v,ð, n, m,ŋ /+ all the vowels
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For example:
- calls [kɔ:lz]
- destroys [distrɔɪz]
- gives [gɪvz]
- moans [məʊnz]
- sobs [sɒbz]
- tries [traiz]
If the last syllable of the verb sounds like:
Then the suffix is pronounced /iz/. For example:
- faces /'feɪsɪz/
- misses /'mɪsɪz/
- dozes /'dəʊzɪz/
- hushes /'hʌʃɪz/
- catches /'kætʃɪz/
- nudges /'nʌdʒɪz/
The -es is pronounced as a separate syllable: /ɪz/. Therefore, if a verb ends in one of these sounds, the present tense will have one more syllable than the simple form.
Examples:
- fix (1 syllable)-->fixes (2 syllables)
- kiss (1 syllable)-->kisses (2 syllables)
- wash (1 syllable)-->washes (2 syllables)
- watch (1 syllable)-->watches (2 syllables)
- damage (2 syllables)-->damages (3 syllables)
- memorize (3 syllables)-->memorizes (4 syllables)
- exercise (3 syllables)-->exercises (4 syllables)
Source: http://www.brighthubeducation.com/esl-lesson-plans/39426-spelling-and-pronuciation-rules-for-simple-present-tense/
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