28.　 He often cleans his bedroom. (改为一般疑问句)

27.　 I like collecting stamps and singing. (改为否定句)

26.　 They are going to see a film tomorrow. (对画线部分提问)

25.　 I’d like to join them.(改为一般疑问句)

24.　 The children have school today. (改为否定句)

23.　 It is a fine day today.　 (改为感叹句)

22.　 I know his telephone number. (改为一般疑问句)

21.　 Please turn off the light. (改为否定句)

20.　 Su Yang is asking Ben some questions. (对画线部分提问)

19.　 Do you like spring? (加上winter 改为选择疑问句)