Grammar and Style

The One-Stop Grammar Shop
OWL- Purdue University’s Online Writing Lab
http://owl.english.purdue.edu/owl/
Grammar: http://owl.english.purdue.edu/owl/section/1/5/
Mechanics: http://owl.english.purdue.edu/owl/section/1/4/
Punctuation: http://owl.english.purdue.edu/owl/section/1/6/

Purdue University’s Online Writing Lab is one of the most comprehensive and highly trafficked writing resources on the web. The Grammar section covers rules for prepositions, verb tenses, and subject-verb agreement. The Mechanics section addresses sentence clarity, fragments, modifiers, and parts of speech. The Punctuation page addresses what its name suggests.

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Commas, Verb Agreement, and Dashes (in a Dash)
Grammar and Punctuation
http://writing.wisc.edu/Handbook/GramPunct.html
For a succinct guide to subject-verb agreement, commas, and other "greatest hits" of punctuation, consult this easy to navigate series of articles from the University of Wisconsin-Madison.

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Style Elements beyond the Citation
A Quick Guide to Style Manuals
http://grad.berkeley.edu/acapro/pdf/style_manuals.pdf
University of California-Berkeley provides a thorough bibliography with information and links for such lesser-known style manuals as the digital style guide and the official AP style guide.

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Never Say “Said” Again: A Guide to Better Quotations
Quotations
http://writingcenter.unc.edu/resources/handouts-demos/citation/quotations
This basic tutorial from the University of North Carolina Chapel Hill offers tips and tricks for weaving quotes seamlessly into your text. Learn when to choose a quote and when to paraphrase and, perhaps most important, find dozens of synonyms for the boring word "said."