1- Personal names that end in s in the singular can make the possessive with either an apostrophe and an extra s or simply an apostrophe. The apostrophe and the extra s is the most commom.
Charles's car. ( is more commom than...) Charles' car.
2- Classical names often make the possessive simply with an apostrophe.
Venus' beauty. Socrates' words.
3- No matter whether a personal name ending in s takes an apostrophe with or without an extra s, in spoken English, an extra unstressed syllable/iz/ is added.
4-When a name ends in ss, its possessive form is always 's.
Mr. Cross's house is sheer luxury!
5- Regular plurals make the possessive with just an apostrophe.
Dogs' noses are generally cold.
6-When there are two or more possessors of the same belongings or possessions, the apostrophe can be attached either to each possessor or simply to the last possessor.
Mark and Joanne's daughter is a beautiful girl.
Mark's and Joanne's daughter is a beautiful girl.
See you later!!
