句型转换。

1. Tina used to play tennis with her friend on the playground. (改为否定句)  

Tina _______ _______to play tennis with her friend on the playground.

2. Many visitors will come to our city in May. (对划线部分提问)

_______ _______many visitors come to our city?

3. The boy is so weak that he can’t walk a long time. (改为同义句)

  The boy is _______weak _______walk a long time.

4. He asked me, "Do you often help your mother with the housework on weekends?"(句意不变)

He asked me _______I often_______my mother with the housework on weekends.

5. 我们应当勤洗手、多锻炼，以防甲型H1N1流感。

We should often _______our _______and do more exercise to prevent the A／H1N1 flu.