句型转换
（1）She is a nurse.（改为一般疑问句） 
                                                                                 
（2）They are nurses. （对划线部分提问，2种）
                                                              
（3）Her mother is a factory worker.（对划线部分提问）
_______  _____her mother ______?
（4）The twins are students.（对划线部分提问）
               the twin do?
（5）He works on the farm. （改为一般疑问句）
                                                                     
（6）Alice likes singing（对划线部分提问） 
                                                                            
（7）She teaches the students English.（一般疑问句）
                                                                  
（8）She always makes sweets（改为否定句）
                                                                         
（9）She can help sick people（改为否定句）
                                                                         
（10）Mike works on a farm.（根据划线部分提问）
                                                                      
（11）I teach English at school. （用he 改写句子）
                                                                    
（12）What does your sister do? （改为同义句）
________ your sister?
（13）Are you workers? （作否定回答）