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Definition of -s suffix from the Oxford Advanced Learner's Dictionary

-s

suffix,

-es

The pronunciation is formed by adding /z/ after vowels and voiced non-sibilants, /s/ after voiceless non-sibilants, and /ɪz/ after the sibilants /s z ʃ ʒ tʃ dʒ/.
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  1. (makes the plural of regular nouns)
    • cats
    • potatoes
  2. (makes the third person singular of regular verbs)
    • sees
    • watches
buttercup
noun
 
 
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Plants and trees
C2
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