It was possible that 句型后面是固定用虚拟语气么?

It is + adj.+that ...这种句型后面都一定要用虚拟语气是吗? it is worthwhile that这个句型后面的that从句部分需要使用虚拟语气吗? 虚拟语气中"it"后面be动词是用"was"还是"were"? 虚拟语气句型“it is (high)time that”中的is变成was It is time that 后面虚拟语气的be动词可以使用was吧,因为基本其他的虚拟语气be动词不管单复数都要用w 主语从句句型 It is no wonder that...从句中是否要用虚拟语气呢? it's strange that后面加should吗?是虚拟语气还是竟然的意思? It seemed that the world was at an end .这句话是虚拟语气吗? 请问“It seems to me that...”后面要用虚拟语气吗? it is necessary that后面要用虚拟语气吗?（即加should do）. it's time that 从句用虚拟语气did .那从句中是用was 还是were? it is high time that 是虚拟语气,后面可加过去时或should do,那是不是所有虚拟语气后都可以加