1．I was watching TV when Mother came in．（用while替换）

          I was          TV，Mother came in．

2．Mr. Wang told us, “We will have a long holiday．”（改写为间接引语）

Mr. Wang told us                   have a long holiday．

3．They will go to Beijing on vacation next week．

They will have enough time．（合并为含if的复合句）

They will go to Beijing on vacation next week          they          enough time．

4．You should come here by bike．（改为否定句）

You                   here by bike．

5．Ted saw an alien yesterday．（改写为一般疑问句）

          Ted          an alien yesterday?

6．The boy was riding a bike when the UFO landed? （对划线部分提问）

          was the boy          when the UFO landed?

7．John did his homework last night．（用at nine o'clock last night替换last night）

John                   his homework at nine o'clock last night．

8．Brazil will win the World Cup next time．（改写为一般疑问句）

           Brazil          the World Cup next time?

9．I got to school late because the traffic was very busy．（对划线部分提问）

                    you get to school late?

10．Could you please open the window? （改写为同义句）

          you mind          the window?