18.　 I like autumn best. (改为否定句)

17.　 It’s cold in winter there. (对画线部分提问)

16.　 It always rains in summer there. (改为一般疑问句，作肯定回答)

15.　 I get to the shopping centre by bus. (对画线部分提问)

14.　 The policeman caught the thief. (改问正在进行时)

13.　 Give the purse to me. (换一种说法，句意不变)

12.　 Don’t go along this street. (改为肯定句)

11.　 Are they American cars? (改为单数)

10.　 The computer is very nice. (改为感叹句)

9.　　　 How can I get to the shopping centre? (改为同义句)