1. Chapter 26: Punctuation
Commas: Interrupters

2. Interrupters
Key Concept: Use a comma to set off nonessential appositives and appositive phrases.
Appositive phrase: noun or pronoun with modifiers describing another noun or pronoun.
The basketball team, currently undefeated, is doing very well this year.
Prime rib, which takes a few hours to cook, is a popular holiday main dish.

3. Interrupters
Key Concept: Use a comma to set off words used in direct address.
D.A.: Names a person or group being spoken to.
Students, please hand in your work from yesterday.
I need out of the game, coach.

4. Interrupters
Key Concept: Use commas to set off parenthetical expressions.
Parenthetical: side remark adding information
Naturally, Americans celebrate holidays with food.
A lot of snow, for instance, could cause travel delays.
Incidentally, her headache was worse when there were screaming children.