The way to form possessives in English is to add ‘s to...

The way to form possessives in English is to add ‘s to regular singular nouns and noncount nouns and irregular plural nouns not ending in s or to add an apostrophe after the s ending of regular plural nouns and after singular/noncount nouns ending in the sound /s/ to form ‘s.
Celse-Murcia (2013) affirms that, besides possession, the genitive form can indicate: 

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