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This is
the boss's chair. Is "boss's" the correct form?
Yes. I learned that if a
word ends in an S, there is no S following the apostrophe in the word's
possessive case.
That's only true for plurals. Singulars add 's in virtually all cases. But I often see cases like "boss's". I wonder which is
the correct form of the possessive case. Whichever is the rule, does it
apply to both nouns and proper nouns?
Yes. There is nothing different about the rules which hinges on whether the noun is common or proper.
>>
the boy (singular). the boy's (belonging to the boy)
the boys (plural). the boys' (belonging to the boys) [not boys's]
the boss (singular). the boss's (belonging to the boss)
the bosses (plural). the bosses' (belonging to the bosses)
the child (singular). the child's (belonging to the child)
the children (plural). the children's (belonging to the children)
CJ