表示目的

　　1.The purpose of a test is to show what you have learned about a subject

　　2. Believe it or not，her only purpose in saying all that is to help you help yourself

　　3.Competitive sports are recommended to young adults to prepare them for the competitive world of colleges and business

　　4.The ultimate object of scientific inquiry is to discover the laws of nature.

　　表示举例

　　1.Take，for example，the emergency situations that we encountered almost every night

　　2.In the case of Lincoln，the story is true

　　3.Where there is will，there is a way. Your eventual success in the examinations is a case in point.

　　4.For my own part，everything is O.K. I have nothing to complain of

　　5.As an example of modern credulity，he cites the widespread belief that lucky numbers bring people good luck.

　　6.An illustration may make the point clear.

　　7.Every side of our lives is affected by our jobs such as where we live，what we eat and the company we keep