The young couple(were)seen to walk along the beach at nightfall.为什么要用过去式?
问题描述：
The young couple(were)seen to walk along the beach at nightfall.为什么要用过去式?
答
被动be动词为什么用were为什么不用areAt nightfall过去时nightfall是傍晚，怎么会是过去式根据语境啊，当然是过去懂了，谢谢回答