我参加过的即兴演讲是在演讲后评委组会给一个问题，让你直接回答，不知道你的是不是这样。首先要明确题意（通常是个论点）让你去阐述你的想法。首先不要慌，可以停几秒整理下思路，然后尽量运用你会的单词和句式去清楚地表达（可以适当慢一点），眼神要与评委交流，可以加适当的手势，总体还是看你的日常的英语实力。

最重要是开头,开头简单点,英语演讲不需要复杂的句子,不要加太多从句或者复句,也不要加太多修饰,最好是简单易明.容易理解的句子,不需要思考的句子.由浅入深,像语文议论文大概那样吧,有论点,有中心

求5分钟的英语即兴演讲材料,自选话题

ladies and gentlemen，today it's my great honor to have the chance to give a speech in here. My topic isreality TV shows (真人秀）With the development of times, reality TV shows like Super Boyls and Good Vioce in China have been so popular that attracted thousands of people to participate. However, people’s opinions are dividedon this point. Those who are in favor of TV shows claim that it has a lot of advantages. On the one hand, TV shows provide excellent opportunities for the youth to express themselves and to show their specialty. On the other hand, TV shows contributes to developing their self-confidence and feeling the world themselves. Those who are opposed to TV shows hold the view that its disadvantages are many. Because TV shows make so many students or employees give up their school work or jobs which does harm to their normal life. All in all, nothing should be carried to extremes, and we ought to be more tolerance for TV shows. As long as they can bring happiness to us, TV shows should be all right as well.Do you agree?Thank you for listening.