It's used for teaching grammar. Students seemed interested in it. Before my lecture in the classroom, I gave out a handout about this grammar and asked students to watch this video clip and fill out some blanks on my handout. Just like a flipped classroom, it worked and I succeeded in catching students' attention. The only problem is the sound. It was a little noisy. For the better result,I need to improve recording skills.

The handout for students is this :