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Lumen Learning
Lumen: Grammar: Punctuation
This lesson plan focuses on the roles of all of the punctuation marks; it provides a video, small practices in various sections, and a punctuation self-check.
University of Victoria (Canada)
The U Vic Writer's Guide: Knowing the Basics of Grammar
This grammar tutorial for college students features help on verb agreement, the use of semicolons, sentence structure, and more.