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I set this video up to practice passive vs active voice by means of 13 multiple choice questions. In some of the questions I picked verbs whose active form already implies sort of a passive meaning, e.g. "accumulate", "surge", "decline", and test whether students can decide between the passive and the active voice. In other questions I gapped passive voice constructs, and again check if students can guess the right form.


I also included some advanced passive constructs, e.g. passive ellipsis: "When exposed to sugar ..." (=when it is exposed to ...), and "is to blame" (=has to be blamed).

Because hearing the well-formed sentences is a huge help for students, I decided to make the task more difficult by mischievously letting the video play on after each gapped sentence to wipe out their hearing memories a bit. :)

I think the biggest merit of such a video-based grammar quiz is to prompt students to pay attention to and notice certain grammar structures, which they may otherwise ignore when simply 'consuming' the content of a video.

This 5-minute TedEd video deals with the causes of cavities and how we can avoid them.