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