If a singular word ends in -ss we also add 's to add a possessive apostrophe (princess's room; boss's office). Children learn how to use possessive apostrophes for singular words in Year 2. If a number of nouns own something, we need to use a plural possessive apostrophe: Elephants'...
The worst case of abuse of the possessive rules was when a colleague, who habitually uses “I” where he should use “me”, made the declaration one day that “… this idea was John and I’s.” I nearly fell off my chair. Because he became entrenched in abusing one rule, he was f...