告诉听众发言的长度
- During the next ten minutes, I shall...
- I shall be speaking for about ten minutes...

- My presentation will last for about ten minutes...
- I won't take up more than ten minutes of your time...
- I don't intend to speak for longer than ten minutes...
- I know that time is short, so I intend to keep this brief
- I have a lot to cram in to the next ten minutes, so I'd better make a start...

引起听众的兴趣
- I'm going to be speaking about something that is vitally important to all of us.
- My presentation will help solve a problem that has puzzled people for years...
- At the end of this presentation you will understand why this company has been so successful for so long...
- I am going to be talking about a product that could double your profit margins...
- the next ten minutes will change your attitude to sales and marketing...
- Over the next ten minutes you are going to hear about something that will change the way your companies operate...
- By the end of this presentation you will know all there is to know about...

告诉听众内容要点
- there are five main aspects to this topic (...the first, ... the second, ...a third, ...another, ... the final)
- I am going to examine these topics in the following order (...first, ...next, ...after that, ...finally)
- I've divided my talk into five parts...
- I will deal with these topics in chronological order...
- I'm going to start with a general overview and then focus on this particular problem (...in general, ...more particularly).
- I want to start with this particular topic, and then draw some more general conclusions from it (...specifically, ... in a wider context).
- there are (a number of) factors that may affect...
- We have to take into account in any discussion of this subject, the following considerations.
- We all ought to be aware of the following points.