Note: The form '-es' is also used. The suffix '-s' is pronounced / -s / after the consonant sounds / p, t, k, f / or / θ /. After other sounds '-s' is pronounced / -z /. The suffix '-es' is pronounced / -z / after vowel sounds, and / -ɪz / after consonant sounds.
1.
-s or -es is added to a noun to form a plural.
...her two beloved cats.
...a few problems.
...new houses and flats...
Most bosses are traditional.
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2.
-s or -es is added to a verb to form the third person singular, present tense.
He never thinks about it...
She likes her job...
No-one wishes to see that.
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