Learning English Online

http://www.englisch-hilfen.de/en/index.htm
You can learn English words, practise grammar, look at some basic rules, prepare for exams, do some tests or just have fun playing games. Enjoy yourself with more than 550 online exercises.

Grammar Online
http://online.ohlone.cc.ca.us/~mlieu/gro...index.html
A Useful Web Site : These lessons include explanations, exercises, and answers. You will do some of the grammar on the computer screen. You will do some of the work using pencil/pen and paper. grammarONLINE is not as good as having a teacher help you, but it will help you understand and use English grammar better

EnglishClub Grammar
http://www.englishclub.com/grammar/index.htm
Many of these grammar lessons also have quizzes to check your understanding. If you still don't understand something, feel free to ask a question at the Grammar Help Desk.

The Internet Grammar of English
http://www.ucl.ac.uk/internet-grammar/
The Internet Grammar of English will be accessible free of charge to users from UK educational institutions (i.e. for those who log in from a domain ending in .ac.uk). For a limited trial period only, IGE will also be accessible free of charge to all other users