New content added on March 3rd, 2016! New sections added for whose vs. who's; loose vs. lose; should've, would've, could've; and the proper spelling of definitely.

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Learn English grammar from a native English speaker and former math teacher! Yes, grammar is not usually taught in math courses, but solid grammar skills are required to effectively teach math courses (or to teach any course using the English language, really).

This course is all about teaching the difference between its and it's; the difference between your and you're; the difference between there, they're, and their; and some other topics.

These words are frequently misused, as anyone who reads comment threads on Facebook, YouTube, or anywhere else on the Internet knows. If you are someone who likes to argue on the Internet (who doesn't?) then knowing how to correctly use these words will give you an advantage over your opponent!

Also, and perhaps more importantly, knowing how to correctly use these words can help you more effectively draft a résumé and cover letter for a job application, helping you stand out from other applicants who may not know how to use these words.