句型转换
That is my good pen friend.（改为复数句子）
my good pen                                       .
This is her family photo.（变为一般疑问句）
                            her photo?
Tom is Mr Green’s son.（改为否定句）
Tom                             Mr Green’s son.
Those are my friends. （对划线部分提问）
              are  those?
They are orange backpacks.（改为单数句子）
                            orange backpack.