关于sat语法的问题两种常考虚拟搭配1、ifsbwere,sbwould...2、ifsbhaddown,sbwouldhavedone.1、上面的总结是否有错（请别给我一大推的信息）2、是否两个的if都可以省略?因为我现在正在一道sbwere

Question

关于sat语法的问题
两种常考虚拟搭配
1、if sb were,sb would...
2、if sb had down,sb would have done.
1、上面的总结是否有错（请别给我一大推的信息）
2、是否两个的if都可以省略?因为我现在正在一道sb were 前if省略的题目
3、有一道题是这样子的
If there had been a power failure,the hospital will run on electricity from its own generators,which can operate 200 hours.
If there had been被划线
should there be
当后面是个现在时的will时,这算是什么用法啊?

Answer 1

不要着急下结论,我看到了你先前的提问以及网友给出的答复,不尽如人意.
两种常考虚拟搭配
1、if sb were,sb would...
2、if sb had done,sb would have done.
1、上面的总结是否有错 ------------总结正确 看两个例子
If I were you,i would tell him the truth.如果我是你,我就把事实告诉他
If I had known the truth,I would have told him.如果我知道真相,我早就告诉他了.
2、是否两个的if都可以省略?--------------都不可以省略.因为这两句是必须具有if的虚拟条件句.稍后告知虚拟条件句中省略if的情况
省略if的虚拟条件句：在虚拟条件句中,如果谓语包含were(was),had,should等词,且这些词放在主语前,需省略if.如：
* Were you not here,none of us would come.如果你不再这儿,我们谁都不会来.
If she should come here,we would go out at once.
3.If there had been a power failure,the hospital will run on electricity from its own generators,which can operate 200 hours.
If there had been被划线
答案为：should there be
当后面是个现在时的will时,这算是什么用法啊?
这是个虚拟语气特殊情况：在有些情况下,条件句中的谓语有should+动词原形构成,这是主句的谓语动词即可以是虚拟语气,又可以是陈述语气或祈使语气.如：
if it should rain,the plan will be called off.如果下雨,计划就被取消
should anyone phone,please tell him i'm busy.若有人来电话,告诉他我在忙
if it should get stormy,i will go.即使下暴雨,我也要去.