Here is a description of the video: The video shows a classroom setting. A woman stands near a whiteboard, dressed in a long patterned dress and brown shoes, holding a book. On the whiteboard, there are notes written with a marker, including the date, the word "Infinities", and some grammar notes. In the foreground, a desk is visible with papers on it. The papers appear to be a vocabulary quiz titled "FOCUS B21 VOCABULARY QUIZ 1 GROUP B," with some answers filled in. Part of a person is seen sitting at the desk wearing a gray sweater.