句子加工厂
静寂笼罩着这座水上城市。 
1．改成“被”字句：                                                                                                          
2．改成设问句：                                                                                                                 
3．改成双重否定句：                                                                                                         

句子加工厂  
1．这里的景色难道不美吗？（改成陈述句） 
                                                                                                      
2．威尼斯是世界闻名的水上城市。（缩句）  
                                                                                                     
3．静寂笼罩着这座水上城市。（改成反问句）