"Definite" versus "Indefinite" Articles: their differences, when to use them, when not to use them

Here are some resources that explain the difference between "definite" and "indefinite" articles as well as how to use them:

• The University of Adelaide offers simple explanations, videos and exercises
• YouTube Video:  http://www.youtube.com/watch?v=jHi2gRNsTxg
• A PDF explanation from the University of New England
• The University of Toronto provides a very nice printable sheet that summarizes articles
• An explanation from a website called "Quick and Dirty Tips"
• The British Council has a good website on the subject of articles - look on the right-hand side menu pane for the "articles" hyperlink
• Purdue OWL

These websites clarify when NOT to use an article in front of a noun:

• English Teacher Melanie

Once you think you've mastered articles, you can try the following online exercises to test your skills:

• English Exercises
• Impact English