1. The best way to help her is giving her a dictionary.（就划线部分提问）  

                  the best way to help her?

2. Alice needs to have a rest.  Bob needs to have a rest, too. （改为同义句）

                Alice          Bob          to have a rest.

3. Nancy wanted to be a tour guide.（就划线部分提问）

              did Nancy want                  ?

4. My daily life is not the same as yours.  (改为同义句)

  My daily life is                           yours.

5. Dave used to play soccer with his classmates. (改为一般疑问句)

              Dave          to play soccer with his classmates?   

6. My mother has been an English teacher since 1990. （就划线部分提问） 

                       has your mother been an English teacher?    

7. That old horse died three months ago. (改为同义句)  

     That old horse                            for three months. 

8. I couldn’t decide which one I should buy.  （改为简单句） 

     I couldn’t decide which one                   .