在虚拟语气中should有时候可以省略,但是would,could,might在任何情况下都是不可以的是吗?

1.当虚拟条件句的谓语动词含有 were,should,had 时,if 可省略,而将 were,should,had等词置于句首.如：
Should he agree to go there,we would send him there.
要是他答应去的话,我们就派他去.
Were she here,she would agree with us.
如果她在这儿的话,她会同意我们的.
Had he learnt about computers,we would have hired him to work here.
如果她懂一些电脑知识的话,我们会已经聘用他来这里工作了.
2.有时,虚拟条件句中,主、从句可以省略其中的一个,来表示说话人的一种强烈的感情.
①省略从句
He would have finished it.他本该完成了.
You could have passed this exam.你应该会通过这次考试了.
②省略主句
If I were at home now.要是我现在在家里该多好啊.
If only I had got it.要是我得到它了该多好啊.
具体情况具体分析.