Guide to Grammar and Usage Use a period after a complete sentence. 296 Example:My dog is named Spot. Use a period after a command. Example:Fasten your seatbelt. Use a period after most abbreviations. Examples:Dr., Ms., Jr. Use a period after an initial. Example:John F. Kennedy Use a period after each Roman numeral, letter, or number in an outline. Example: I. 1. 2. · Question marks Use a question mark after a question. Place the question mark inside closing quotation marks if it is part of the quotation. If not, place it outside the quotation marks. A. B. Examples: "Where are you going?" Chris asked. Do you know who wrote "The Raven"?