Commas 1

■When a full date is written out, there should be a comma between the day and the year, as well as after the year if the sentence continues. 

–I was born February 3, 1985, and it snowed that day.

Three or more items in a list should be separated by commas. 

–I ate tacos, burritos, and nachos at Taco Bell.

–She drove home from work, ate at Taco bell, and then shopped. 

An introductory phrase does not have a subject or a verb. They tells where, when, why, or how.

An introductory clause tells background information for the main part of the sentence and begins with an adverb.

To stay in shape for competition, athletes must exercise every day.

If they want to win, athletes must exercise every day.

For

And

Nor

But

Or

Yet

So