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Here are several websites covering various elements of grammar. If you're ever confused about parts of speech or usage, or just want to boost your writing skills, explore these sites!
 
This site is large and complex, but if you have any questions about grammar, you'll probably find the answer here!
 
I like this site because it also has online quizzes, and discusses words that can be used in multiple ways.
This might be my favorite online writing resource. Lots of information, and user-friendly. Includes practice exercises.