Grammar links

http://www.helpforenglish.cz 

http://www.english-online.cz

http://www.jazyky-online.info/anglictina

http://www.e-gramatica.com

http://www.english-online.org.uk 

http://www.ego4u.com

http://www.learnamericanenglishonline.com

http://www.english-online.at
http://www.learn-english-online.org

http://www.grammar-monster.com/
http://elt.oup.com/student/practicegrammar/basic/?cc=cz&selLanguage=cs
http://www.learnenglish.de/englishtestspage.html
http://www.towson.edu/ows/index.aspx#Sentence%20Structure%20Exercises
http://esl.fis.edu/grammar/index-q.htm
http://www.eslgold.com/grammar/basic_sentence.html