Impromptu speaking can be mastered if you use some fundamental techniques:
First and foremost, take your time. If you go blank, (which usually happens in transitions)--use the five second
stall. You could say something like, "I have often wondered about that," or
"I am glad you asked that question." or "Did you ever wonder. . . .?"
If you give yourself about five seconds you will always have something
to say. Remember to get our attention and introduce what you will talk about (introduction), talk about your topic (body), summarize what you talked about and leave us with a memorable close (conclusion). Connectives are a great way to keep your speech moving. Take your time, be creative and have fun.
FUNdamentals of impromptu speaking:
1. State your viewpoint in the early stages and start strong.
2. Choose a specific illustration, experience or example.
3. Don't try to cover too much ground.
4. Absolutely never apologize.
5. Finish conclusively.