与过去事实相反的虚拟语气例句和其的倒装句
一）虚拟语气用在与过去事实相反的假设的条件句中：表示假设，后悔或推测。
句型结构：If +主语+had been\\\/done….，主语+should\\\/could\\\/might\\\/would + have done….1. If the illness had been diagnosed a day earlier, it might have made all different.2. If she had told him about the danger, he would not have got hurt.3. If I had known more about giving first aid, I could have helped him.
给你一个句子，如何辨别虚拟语气中的三种时态，请举例子
一、在事实相反若与现在事实相虚拟语气的条件从谓语用过去式(be通常用were)，主句谓语用should (would, could, might)+动词原形”。
如：If you took a taxi，you'd get there quicker. 如果你坐出租车去，你可以快一点到那里。
(但你不坐)If I knew her number I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。
(可惜我不知道)二、与过去事实相反若与过去事实相反，虚拟语气的条件从句的谓语用过去完成时(had+过去分词)，主句谓语用“should (would, could, might)+have+过去分词”。
如：If I'd left sooner，I'd have been on time. 要是我早点动身，我就准时到了。
(但我动身太迟了)If we had found him earlier we could have saved his life. 要是我们当时早点找到他的话，我们就可以救活他。
(可惜我们找到他太晚了)三、与将来事实相反若与将来事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”。
如：
if的虚拟语气有对过去的，现在的，将来的虚拟，是怎么写的
1、表示与现在事实相情况：从句：If+主+时(Be动词用were)主句：主语+ should\\\/would+do：1．If I were you,I would take an umbrella.如果我是你会带把伞。
（事实：我不可能是你）2、表示与过去事实相反的情况从句：If+主语+had+done主句：主语+should\\\/would+have doneeg：1． If I had gotten there earlier,I should\\\/would have met her. 如果我早到那儿，我就会见到她。
（事实：去晚了）3、表示对将来情况的主观推测从句：①if+主语+were to do （if 表示未来的虚拟语气独有该形式，其他如wish， even if等词都没有该形式来表示未来的虚拟语气）②if+主语+should+do③if+主语+过去式（be动词用were）主句：主语+should\\\/would+doeg：1．If he should come here tomorrow,I would talk to him.如果他明天来这儿的话，我就跟他谈谈。
（事实：来的可能性很小，不可能）当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句首，这种多用于书面语。
对过去的虚拟的两个例句
If I were there yesterday, the accident could not have happened.Had it not rained last night, the party would have gone on forever.
这句话应该是 ，对过去，还是现在 虚拟呢
他的帮助和取得进步，都发生在说这句话之前，因此，从句和主句都是与过去事实相反的虚拟语气。
You couldn't have made such great progress in study without his help.You couldn't have progressed so quickly in study without his help.
这两句话是对什么的虚拟，现在还是过去还是将来
都是对过去如果发生的情况但是最终没发生的这样一种情况的虚拟，因此后半句用了过去将来时表示如果过去怎样，就将会怎样的意思。
划线句子，是对过去的虚拟还是对现在的虚拟
为什么④不是填would have remained
划线的句子有从句，主句是过去式，而从句是用if引导的虚拟语气，所以要用过去完成时，而主句已经是过去式，所以从句根据语意是过去的过去，所以用过去完成时。
would后面一般跟动词原形，因为would一般作为情态动词修饰。
