Here's a short list of some TED-Ed videos about the English language and literature that may be useful in class.
From The Writer's Workshop playlist, this one on apostrophes is particularly good. There are others on semicolons, Oxford commas, regular commas, and so on. We think this is great material for writing and grammar classes.
This video explores how the plural -s came into the English language. Many of the videos in the Playing With Language playlist explore English from a historical linguistics perspective, which may help students in more advanced levels make sense of the many irregularities in the language.
Teachers in reading classes may enjoy using videos from the Reading Between The Lines playlist. This video on tragedy helps students understand the components of the form and why its legacy endures - and the Walter White imagery drives the point home.