Simple rules and worksheets with answers for basic grammar and punctuation - very useful!
Accuracy HelpTest yourself Simple explanations and quick tests for grammar, spelling, and punctuation skills.

Grammar, punctuation, writing styles... Fantastic help for all levels of student.
Sentence structure and common errors from Otago University - simple clear explanations and examples
Common errors in English Alphabetical list of all the tricky words. Great help for all levels!
How to write correct sentences
Writing sentences correctly
Online grammar and punctuation games and quizzes - some will be a bit simple for you but lots of fun! Go to http://9eng.wikispaces.com - Literacy skills.
Analysis vocabulary list Great 2 page list of useful words and phrases.
Style and grammar online quizzes and games **English grammar**