句型转换。
（1）I want a hamburger.(就划线部分提问）
                                       
（2）There are some boats on the lake. (改为否定句）
                          _____ 
（3）Your mum gave me a pencil .(改为同义句)
                                   __ _
（4）Sam can ride a bike.(改为一般疑问句)
                            
（5）I’m running now.(用yesterday代替now）