In this Business English lesson plan for adults, students watch a video about how to leave a voicemail and then hear a sample sales voicemail. It includes discussion questions and conversation activities about voicemail greetings and leaving voicemails. Students learn some important vocabulary terms related to this topic. For grammar, students do an activity on prepositions. In the cooperation activity, students do a role play for leaving a voicemail and creating a voicemail greeting.