English 1 (Accelerated)
Capitals
End Marks
Semicolons
Italics
Apostrophes
Other Marks
Chapter 23:
Apostrophes
Rules:
23a. To form the possessive case of a singular noun, add an apostrophe and an
s
.
23b. To form the possessive case of a plural noun ending in
s
, add only the apostrophe.
23c. Possessive personal pronouns
do not
require an apostrophe.
23d. Indefinite pronouns in the possessive case require an apostrophe and an
s
.
23e. In compound words, names of organizations and business firms, and words showing joint possession, only the last word is possessive in form.
23f. When two or more persons possess something individually, each of their names is possessive in form.
23g. Use an apostrophe to show where letters or numbers have been omitted in a contraction.
23h. Use the apostrophe and
s
to form the plural of letters, numbers, signs, and of words referred to as words.
Aren't quite sure? Click
here
for the full text (with explanations and examples).