Short time? Success requires preparation. If you are not prepared, at least understand the knowledge points that should be explained, as well as the connection and overall context of each knowledge point!

Don't tell me you don't have this?

Well, in case you can't talk about anything substantive, let's talk about the background knowledge and related interesting questions. It is best to arouse students' thinking and interactive communication in class.

In fact, in any case, a truly successful class or speech must be well prepared, even if it is miniature. Unless you are quite experienced, skilled and deep, it should be based on your knowledge.