In this Business English lesson plan for adults, students watch a video about email inquiries and how to respond. It includes discussion questions and conversation activities about email inquiries, email pros and cons, and polite and impolite language. Students learn some important vocabulary terms related to these topics. For grammar, students do an activity on the difference between adjectives ending in "-ed" and "-ing". In the cooperation activity, students can collaborate on an activity for writing FAQ's and responding to email inquiries.