Mastering punctuation requires both understanding and finesse. In this program, Mama Napoli, a crossing guard, and other savvy English authorities open a dialogue on punctuation and then skip to the end—of the sentence, that is. The use of the period in commands, in declarative sentences, and with abbreviations; the question mark in interrogative sentences and to show disbelief or sarcasm; and the exclamation point for emphasis are all discussed in detail. (17 minutes)

Punctuation is the system of marks, such as periods, commas, and apostrophes that accompany words in sentences and paragraphs. Punctuation makes things clear for the reader.

The period is used to punctuate a command or statement. It can abbreviate a long word or phrase into a shorter form, as long as a standard abbreviation is used.

Interrogative sentences ask a question and end with a question mark. Used to end a statement it shows disbelief or sarcasm. Question marks may be used to emphasize items in a list.

The exclamation point is a stylistic mark that is used to show excitement, rage or other strong emotion. Choose expressive and precise words to help prevent over-using exclamation points.

Periods end statements and commands and shorten long words. Question marks end interrogative sentences and highlight items in a list. Exclamation points show extreme emotion.