书上说,含蓄虚拟条件句中,"主语的时态要求与含有条件从句的主语要求相同"这句话是什么意思?是指主句和从句都用相同的时态吗

书上说,含蓄虚拟条件句中,"主语的时态要求与含有条件从句的主语要求相同"这句话是什么意思?是指主句和从句都用相同的时态吗?比如这句“Einstein cared little for money,though he could have been very rich”,很明显主句和从句的时态不一样.请各位解释一下我所说的我的书上的那句话…!

"主语的时态要求与含有条件从句的主语要求相同"这句话的意思是
主语的时态要求 与含虚拟条件句 对主句 的时态要求一样
也就是 与现在或将来情况相反 可以用 过去将来时（包括情态动词的过去式加原形动词）
与过去情况情况相反 可以用 过去将来完成时时（包括情态动词的过去式加have done）
如 一下 例句
1.将条件隐含在不定式短语中
I would write to her,but I don’t know her address.我会给她写信的,就是不知道她的地址.(=If I knew her address,I would write to her.But…)
To have studied harder,you would have passed the examination.你学习更用功些,你早就考及格了.(=If you had studied harder,you…)
2.将条件隐含在分词短语中
Born in better times,he would have been a scholar.如果出生在好时代,他早就成为学者了.(=If he had been born in better times,he would…)
Failing this time,what would you do?假若这次失败,那你怎么办?(=If you failed this time,what would…)
Walking alone in the dark,Mary would be terrified.要一个人单独在黑暗中行走,玛丽会感到十分害怕.(If Mary walked alone in the dark,she…)
3.将条件隐含在介词短语中
But for your help we couldn’t have succeeded in the experiment.如果没有你的帮助,我们的实验是不会成功的.(=If it hadn’t been for your help,we…)
In different circumstances,I would have said yes.在不同的情况下,我就会同意了.(=If circumstances had been different,I would…)
4.将条件隐含在名词短语中
Any person who had behaved in that way would have been dismissed.任何人这样做了都会被开除.(=If any person should behave in that way…,he would…)
A few hours earlier,and you would have seen the famous writer.要是你早来几个小时,你就见到这位著名的作家了.(If you had come a few hours earlier,you…)
5.将条件隐含在某些连词中
I didn’t know that he was a cheat,or else I wouldn’t have believed him.我不知道他是个骗子,不然我也不会相信他了.(or else=if I had known he was a cheat))
I’m really very busy,otherwise I would certainly go there with you.我真的是太忙了,不然我就会同你一道去了.(otherwise=if I were not so busy)
6.将条件隐含在定语从句中
Anyone who had seen that painting might have taken it for a photo.凡是看过那画的人,都可能把它看成是照片.(=If anyone had seen that painting…)
7.将条件隐含在一定的上下文中
You might stay here forever.你可以永远待在这儿.(=If you wanted to,you might…)
Don’t bother to read all these papers.It would take too long.不要费事看所有这些文件了,那会花太多时间.(=…If you read all these papers,It would take too long)
而你的句子 “Einstein cared little for money,though he could have been very rich”不是 含蓄 虚拟条件句 though 引导的是让步状语从句 从句 中的情态动词 是对过去情况的判断 .
,
再问： 书上说这个句子是一个并列句
再答： though he could have been very rich 如果 是并列句的话 ， 就是含蓄 虚拟语气 可单独看待 表示与过去情况相反 所以谓语用 could have been 符合 主语的时态要求与含有条件从句的主语要求相同"
再问： how不是关系副词吗？有的书说是，有的说不是。这该如何判断？
再答： how不是关系副词 因为它不能引导 定语从句 有的书说是 是因为 概念 不一样 ，把引导名词性从句的连词 也视为关系词 how是 连接副词 疑问副词 可以引导名词性从句 和特殊疑问句