| Term | Definition |
| Use apostrophes for common | contractions |
| Use apostrophes in place of omitting | letters or numbers |
| Use apostrophes to express | time or amount |
| Use apostrophes to form | possessives with compound nouns |
| Use apostrophes to form certain | plurals |
| To form the possessive of a singular word | add an apostrophe and an S (girl's) |
| To form the possessive of a plural word that ends in S | usually add only an apostrophe (girls') |
| To form the possessive of a plural word that DOES NOT end in S | add an appostrophe and an S (women's) |
| To form the possessive of a shared item | add an apostrophe and an S to the last item in the list (This is Jennifer, Jill, and Cynthia's project.) |
| To form the possessive of individual ownership in a series | add an apostrophe and S to EACH item (This is Jennifer's, Jill's, and Cynthia's project.) |
| To form the possessive of indefininite pronouns | add an apostrophe followed by an S (Is this anyone's project?) |
| To form the possessive of a singular word (1 or more syllable) that ends in S or Z | either add the apostrophe after the S (Kansas' ) or add the apostrophe and another S (Kansas's) |