It would be great to go to the Great Wall.这句是虚拟语气吗

问题描述:

It would be great to go to the Great Wall.这句是虚拟语气吗

是虚拟语气怎么去分析这句子结构,是从哪看出是虚拟的主系表。 would be 是典型的虚拟语气