U10 - Articles
8. 1. 2014
Theory:
http://www.helpforenglish.cz/article/2006072901-cleny-v-anglictine-articles
Exercises:
http://www.helpforenglish.cz/article/2006080501-cleny-v-anglictine-cviceni-1
https://www.learnenglishfeelgood.com/english-article-no-article2.html
https://www.learnenglishfeelgood.com/english-article-no-article3.html
More difficult:
http://www.helpforenglish.cz/article/2006112901-george-washington-doplnovani-clenu