English for Teachers B  Presentation Structure    Overall Structure    Useful Structure Phrases    1      Useful Language    Giving a Good Conclusion    2      Making a Killer Introduction  Explain the meaning of the expressions below.     hook the audience theme song crucial burst at the seams with confidence vivid credibility     Then, watch ​the video​ about how to give a killer introduction to a presentation and answer the  two questions.  1. What are the four steps of the formula introduced in the video?  Step 1: ​________​.  Step 2: ​________​.  Step 3: ​________ ​and ​Preview  Step 4: ​_________________  2. What does the speaker mean by ​‘Preview’ ​in Step 3?    3