TED-Ed

View full lesson: http://ed.ted.com/lessons/comma-story-terisa-folaron It isn't easy holding complex sentences together (just ask a conjunction or a subordinate), but the clever little comma can help lighten the load. But how to tell when help is really needed? Terisa Folaron offers some tricks of the comma trade. Lesson by Terisa Folaron, animation by Brett Underhill.