Commas! Commas! When or why do we need to use commas? Dr. Comma introduces the purpose for commas. He reveals that commas are needed to separate items in a list, separate a series of phrases, place before a conjunction, place after an introductory clause, place when writing dates, place when writing greetings and closing letters, set off quotations, place between two adjectives that describes nouns, and place after introductory words. To become proficient in using these commas effectively, he encourages students to participate in the examples, practices and a quiz of this powerpoint presentation.