英语高手进,有几个问题亟待解决if had been able to answer all of them,he wou

英语高手进,有几个问题亟待解决
if had been able to answer all of them,he would have passed the eaxm.此处为什么不用were,不是在虚拟语气中BE都是were吗?
第二个问题：关于seem.他这些日子里情绪似乎很低落,我觉得那是因为他似乎学习上没有多少进步,怕被同学瞧不起.
译文如下：he seemed to be in a low spirits these days,i wonder why.
i think it's becuase he doesn't seem to be making much progress in his studies.he is afraid of being look down upon by his calssmate
经济学家已经得出结论：危机似乎很快就要结束了
译文如下：economists have come to the conclusion that the crisis seems to be coming to an end
seem to be doing 在这二个句子代表着什么?百度一下大家都是进行时,但是没有看到进行时的影子,