This document contains a teacher's resource slideshow for an English grammar lesson on verb tenses and time expressions in the past. It includes examples of questions and answers using the simple past and past progressive tenses, such as "Where did you go?" and "I was studying when Kyung emailed me." It also covers time expressions like "before", "after", "while" and "when" used in past time clauses. The slideshow provides exercises for students to practice identifying and using these grammar points.