1.As the years have gone by，I have been made smaller and smaller.

　　2.Since then，my family and I have been used by billions of people to deal with information and communicate with each other around the world by the Internet.

　　3.I have truly been built to serve the human race since my birth.

　　T：What verb tense is used in these sentences?And what verb voice is used in these sentences?

　　Yes，the present perfect passive voice is used in these sentences.

　　Can you tell us the structure of the present perfect passive voice?

　　Quite right.The structure of the present perfect passive voice is "subject＋have/has been done＋object".The function of present perfect passive voice is indicating verbs' the present perfect and the passive voice.OK，let's practise the present perfect passive voice.

　　Task 1

　　T：Please turn to Page 21.Let's finish Discovering useful structures.

　　At first，look at Ex.2.According to examples，change the following sentences into the present perfect passive voice.Put the verbs into the correct form.

　　Task 2

　　T：Class，let's play a game called "What has been decided".Now，get into groups of four.Your task is to decide what things have been decided for the class.Take turns to make the ideas as interesting and lively as you like.You may finish them according to EXAMPLES on Page 21，（or finish Ex.3 after class.）Then collect the ones you all like best and be prepared to tell them to the class.

　　Task 3

　　T：Now，please turn to Page 57.Finish using structures.First，look at Ex.1 and change the following sentences according to the model，and pay attention to the passive voice form.First do the exercise individually，and then check your answers with your partners.After that we'll check the answers in class.

　　Step 4 Homework

　　T：OK，it's almost time for a break.Now look at exercises on Page 57 and finish them after class.