Punctuation: Commas Are Our Friends 168 Example:The opening of Robert Frost's poem "Stopping by Woods on a Snowy Evening" goes like this: "Whose woods these are / I think I know, / His house is in the village, though. / He will not see me stopping here / To watch his woods fill up with snow." · Use slashes to show choice. Example:Be sure to use the right temperature scale (Fahrenheit/Centigrade). · Use slashes in fractions or formulas. Example: 1 /2, 3 /4 Apostrophes The apostrophe (') is used in three ways: · To show possession (ownership) · To show plural forms · To show where a letter or number has been omitted This is a snap in speech, but in writing it does present difficulties. This is especially true where the three different uses of the apostrophe overlap. The worst offenders are butchers who sell "pork chop's" or "hamburger's." It's still another reason to become a grammarian or a vegetarian. In the meantime, here are the rules for using apostrophes. 1. Use an apostrophe to show possession. · With singular nouns not ending in s, add an apostrophe and s. Examples:girl, girl's manuscript; student, student's ideas · With singular nouns ending in s, add an apostrophe and s.