Pre-Grade Your Paper: Free Online Grammar Checker, Proofreader, and More
"PaperRater.com is a free resource, developed and maintained by linguistics professionals and graduate students. PaperRater.com is used by schools and universities in over 46 countries to help students improve their writing.
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Tips, tricks and tutorials on making Google search easier and effective for novices, experts and everyone else. It also provides PDF cheat sheets of Google search shortcuts.