A, AN, THE

When do we use "a/an"? Do I have to omit the article? Why are you using a plural with no article?... If these are some of the questions you have, I suggest you check this grammar link

http://www.learnenglish.de/grammar/articlestext.htm

and find the answers. Once you have done that, continue with some of the links that will lead you to a variety of graded exercises where you can practise your newly acquired knowledge. Good luck!

http://www.englishpage.com/grammar/Articles/Exercises/
(exercises)

http://depts.gallaudet.edu/englishworks/exercises/main/grammar.html
(exercises)

http://www.agendaweb.org/grammar/articles.html
(graded exercises)

http://owl.english.purdue.edu/handouts/esl/eslartEX1.html
(exercises)

http://www.englisch-hilfen.de/en/exercises/nouns_articles/article_the3.htm
(article or no article)


http://www.learnenglishfeelgood.com/lefg1_mixedarticles1.html
(article or no article)