Use commas to separate items in a series.
When the last two elements of the series are joined by a conjunction, a comma should appear before the conjunction. This is known as the Oxford commma.
When the date is written in the month-day-year style, put a comma between the day and year.
A comma is not needed when:
Use commas to set off individual elements in addresses.
Use a comma before a quotation (unless it is introduced by that, whether, or a similar conjunction).
Place commas (as well as periods) before closing quotation marks.
Use the worksheets to below to reinforce what you’ve learned.
Note on the Worksheets
You can reduce the size of the worksheet by zooming out your browser screen. For Windows users, scroll down the mouse wheel while pressing the Ctrl key in your keyboard.