- 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...

结尾

结束语有这样几种比较精彩的选择：

-Finally...

-By way of conclusion...

-In conclusion, I'd like to...

-I'd like to finish by...

-I hope I have made myself understood

-I hope this has given you some idea/clear idea/an outline of...