地址副词做倒装句子的谓语需要是不及物的吗？进行时是不是有两种倒装方法？
Mary and David were sitting in front of the house.
Sitting in front of the house were Mary and David.
In front of the house were sitting Mary and David.
这两种倒装方法在主语非代词的状况下，都适用进行时加地址副词的吗？谢谢回答！
你的以下倒装形式完全可以：
Mary and David were sitting in front of the house.
—Sitting in front of the house were Mary and David.
—In front of the house were sitting Mary and David.
又如：
His wife was standing beside the table.
—Standing beside the table was his wife.
—Beside the table was standing his wife.
