1. 句型转换

1. （1） They were watching TV when I came in.(对划线部分提问)

   were theywhen you camein？

3. （2） Don't forget to close the window whenyou leave.(改为同义句)

   the window when you leave.

5. （3） Terrorists took down the World TradeCenter.(改为被动语态)

   The World Trade Centerdown by terrorists.

7. （4） I was too scared to think clearlyafter that.(改为同义句)

   I wasscaredI couldn't think clearly after that.

9. （5） What does "perhaps" mean？(改为同义句)

   What's  "perhaps"？