It seemed that the world was at an end .这句话是虚拟语气吗?

It seemed that the world was at an end .这句话是虚拟语气吗? it seemed ai if the world was at an end.虚拟语气为什么是was It seemed that the world was at an end.(句型转换) The world ___ It seemed as if the world was at an end. It seemed as if the world was at an end It seemed as if the world was at an end! It seemed as if the world was at an end 是什么意思 It seemed as if the world was at an end!为什么不用过去完成时 It seemed as if the world was at an end .用英语说出这个句子的好与坏 两个句子：1.It seemed as if the world was at an end.2.If he were 这句话是虚拟语气,但虚拟语气中不是不能出现was吗? It seemed strange that the man who had developed...为什么要用虚拟语气