Recognize YOUR mistakes:
Common Grammatical Errors
Accurately described incorrect/correct sample sentences
http://www.umsl.edu/~keelr/rok/grammar.html
Englishplus.com
Accurately described incorrect/correct sample sentences
http://englishplus.com/grammar/mistcont.htm
Common Errors In English Usage
Compared definitions based on error-prone word pairs
With search engine
http://www.wsu.edu/%7Ebrians/errors/errors.html
Scroll down on this page !
http://www.cbi.edu/literature/errors.htm
University of Kentucky
Prof. Robert Tannenbaum´s very useful hints
http://www.uky.edu/~rst/Hints%20index.html
or
http://www.uky.edu/~rst/Hints.html
Hit Parade of Errors, University of Toronto
http://www.utoronto.ca/writing/hitparade.html
Oxford´s Classic Errors
http://www.askoxford.com/betterwriting/classicerrors/?view=
Jack Lynch´s Grammar and Style Notes
http://www.tp4.ruhr-uni-bochum.de/~ub/HTML/englishgrammar.html
English Language Institute
http://www.eli.ubc.ca/students/language/index.html
Karen´s Linguistics Issues
http://www3.telus.net/linguisticsissues/commonerrorsinenglish.html
J. Hodges
http://www.thomasu.edu/people/jhodges/gramglos.htm
Language Error Analysis (interactive)
http://esl.fis.edu/grammar/analysis/index.htm
Click on Student Writing 1 - 7
List of commonly misused English language phrases
Accurately described incorrect/correct sample sentences
http://en.wikipedia.org/wiki/List_of_frequently_misused_English_words
Garbl´s Editorial Style Manual
http://home.comcast.net/~garbl/stylemanual/a.htm
More ?, Go to the GRAMMAR section.