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I couldn't be more sure.这句话为什么要用could,有虚拟语态吗?

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I couldn't be more sure.这句话为什么要用could,有虚拟语态吗?
they are big all right.这里all right是什么意思,什么成分?这句话的意思是不是 他们确实很大?
he and my other clients know me personally.这里personally是修饰谁的?
I do it my way.这里my way前面是不是缺少介词,my way做什么成分?
I couldn't be more sure.这句话为什么要用could,有虚拟语态吗?
1 I couldn't be more sure.我再确定不过了/我非常肯定.
参看could用法之一
MODAL\x09(与比较级连用,强调某物或某人具备某种特征的程度)太…,再…不过 You usecould not or couldn't with comparatives to emphasize that someone or something has as much as is possible of a particular quality.For example,if you say 'I couldn't be happier',you mean that you are extremely happy.
如The rest of the players are a great bunch of lads and I couldn't be happier...\x09
剩下的选手是一帮很棒的小伙子,我太高兴了.
Darling Neville,I couldn't be more pleased for you...\x09
亲爱的内维尔,我真太为你高兴了.
2 they are big all right.这里all right是 确实;的确 的意思,是副词短语 作状语修饰are big,这句话的意思是 他们确实很大
3he and my other clients know me personally.这里personally是修饰谓语 know的
4I do it my way.这里my way前面可以有in,作方式状语.
再问: 我这本配套的走美语法书上说I couldn't be more sure.和we must've bought the wrong size.表示‘该这样做而实际上没有这样做’,是指过去的虚拟语气。我不知道这是怎么理解的?
再答: 走美语法书上说I couldn't be more sure.和we must've bought the wrong size.表示‘该这样做而实际上没有这样做’,是指过去的虚拟语气。

这种说法是不妥的
因为一个是couldn't 的用法 另一个是must have done的用法。二者风马牛。
意思也不是 表示‘该这样做而实际上没有这样做’,也不是是指过去的虚拟语气。
可以归纳为情态动词的用法
后者是对过去情况的肯定判断,一定如何了。
如the ground is wet.it must have rained last night.地面湿。昨夜一定下雨了。