8.　　　 Turn right at the third crossing. (改为否定句)

7.　　　 He is thirty kilos. (对画线部分提问)

6.　　　 The policeman caught the thief. (改为一般疑问句，作否定回答)

5.　　　 Ben runs fast. I run faster. (两句合并为一句)

4.　　　 Jim is good at English and Maths. (对画线部分提问)

3.　　　 I get up at six thirty every day. (用yesterday morning 替代every day)

2.　　　 Mike runs as fast as Ben. (改为一般疑问句)

1.　　　 He does well in Maths. (改为否定句)

80. Don’t talk! We　　　　　　　 (have) a Maths lesson.

79. The girls　　　　　　　 (watch) a football match next Sunday.