The Appositive
Recognize an appositive when you see one.
An appositive is a noun or noun phrase that renames another noun right beside it. The appositive can be a short or long combination of words. Look at these examples:
The insect, a cockroach , is crawling across the kitc hen table.
The insect, a large cockroach , is crawling across the kitchen table. The insect, a large cockroach with hairy legs , is crawling across the kitchen table.
The insect, a large, hairy-legged cockroach that has spied my bowl of oatmeal , is crawling across the kitchen table.
Here are more examples:
During the dinner conversation, Clifford, the messiest eater at the table , spewed mashed potatoes like an erupting volc ano.
My 286 computer, a modern-day dinosaur , chews floppy disks as noisily as my brother does peanut brittle.
Genette' s bedroom desk, the biggest disaster area in the house , is a collec tion of overdue library books, dirty plates, computer components, old mail, cat hair, and empty potato chip bags. Reliable, Diane's eleven-year-old beagle , chews holes in the living room carpeting as if he were still a puppy.

Punctuate the appositive correctly.
The important point to remember is that a nonessential appositive is always separated from the rest of the sentence with comma(s).
When the appositive begins the sentence, it looks like this:

A hot-tempered tennis player, Robbie charged the umpire and tried to crac k the poor man's skull with a rac ket.
When the appositive interrupts the sentence, it looks like this:

Robbie , a hot-tempered tennis player, charged the umpire and tried to crack the poor man's skull with a racket.
And when the appositive ends the sentence, it looks like this:
Upset by the bad call, the crowd cheered Robbie , a hot-tempered tennis

player who charged the umpire and tried to crack the poor man's skull with a racket.

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