I/ Change into passive voice 15 I have met my friend at the beach. 16 Her teacher gave me a pen last month. 17 She often sweep the floor every morning. 18 No one can do the exercise. 19 They knew that he stole the car. 20 It is difficult to answer the questions 21 She will be able to meet him. 22 He is going to visit the family 23 You must sweep the room everyday 24 We have to learn English every night. 25 They must improve plumbing at the village. 26 He is going to grow vegetables in the garden. 27 She used to drink coffee at night. 28 The people can raise cows at Duc Linh. 29 Have you ever met her? 30 Who can do the exercises? 31 What are you doing?