Comma Practice

Here are some example of when to use a comma.

I ate a sandwich, chips and pudding.
This sentence a comma is used to separate three foods.

He was going to go to the bathroom, but the bell rang.
We use a comma in this sentence because a coordinating conjuction "but" is used.
Other coordinating conjuctions are "and, or, for, yet, then, so and nor" The comma would be placed before the conjuction.

The best sandwich, a ham and chesse the size of Alaska, was also the most expensive sandwich.
This sentence contains an appositive. An appositive is a noun or noun phrase that adds detail to the subject of the sentence. In this case "a ham and cheese the size of Alaka" is adding detail to "The best sandwich". The comma would be placed in the beginning of an appositive and at the end. A littile trick for appositives is to take the noun phrase in between the commas and then read the sentence to see if it makes sense. If it does then the commas are referring to an appositive.