1. 句型转换
sb have/has done sth.
sb have/has not done sth.
Have/Has sb done sth?

1. （1） The astronauts have travelled to the planet．(改为否定句)

   The astronauts  to the planet．
   

3. （2） We have already started to explore other planets．(改为一般疑问句)

        you  to explore other planets ?

5. （3） I think we should look for another hotel to live in．(改为否定句)

       I  we look for another hotel to live in．

7. （4） John reached Paris yesterday．(同义句转换)

     John   Paris yesterday．

9. （5） Her mother has been to Hong Kong several times．(对划线部分提问)

         her mother been several times?