虚拟语气在陈述句中怎么运用?The weather turned out to be fine yesterday.I ____the trouble to carry my unmbrella with me.答案是neednt have taken.可是虚拟语气不是用于复合句中的吗?这里的陈述句为什么要用虚拟语

虚拟语气在陈述句中怎么运用?The weather turned out to be fine yesterday.I ____the trouble to carry my unmbrella with me.答案是neednt have taken.可是虚拟语气不是用于复合句中的吗?这里的陈述句为什么要用虚拟语
虚拟语气在陈述句中怎么运用?
The weather turned out to be fine yesterday.I ____the trouble to carry my unmbrella with me.
答案是neednt have taken.
可是虚拟语气不是用于复合句中的吗?这里的陈述句为什么要用虚拟语气?

虚拟语气在陈述句中怎么运用?The weather turned out to be fine yesterday.I ____the trouble to carry my unmbrella with me.答案是neednt have taken.可是虚拟语气不是用于复合句中的吗?这里的陈述句为什么要用虚拟语
这不是虚拟语气.虚拟语气表示一种不确定或者非现实的情况.而这里的语气是确定的,所以不是虚拟语气.（当然,表示确定的语气也不一定非用虚拟语气,也可以用perhaps、maybe、may等词汇手段表示）
needn't have done表示本来不用做某事.
should have done表示本应该做某事
shouldn't have done 表示本不应该做某事.
must have done 表示肯定做了某事
can't have done表示不可能做过某事
may have done 表示也许做过某事
这些都不是虚拟语气,而是情态动词的用法.

你提出来的是同一论题的不同的方面，下面分两方面作答：
一、含蓄条件句：
所谓含蓄条件句就是利用语境不直接说出条件的句子。这种句子可以分为两类：一种是广义的含蓄条件句，另一种是狭义的含蓄条件句。
1. 广义含蓄指的是不用连词 if 或 unless 介绍条件，而是改用其他方式。事实上这些表达方式也是同样是条件状语。
（1）用介词引入条件：

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你提出来的是同一论题的不同的方面，下面分两方面作答：
一、含蓄条件句：
所谓含蓄条件句就是利用语境不直接说出条件的句子。这种句子可以分为两类：一种是广义的含蓄条件句，另一种是狭义的含蓄条件句。
1. 广义含蓄指的是不用连词 if 或 unless 介绍条件，而是改用其他方式。事实上这些表达方式也是同样是条件状语。
（1）用介词引入条件：
* but for（如不是, 如没有）：注意，凡是出现这个复合介词的句子，必须要用虚拟语气，如：
We would have had a pleasant journey but for the rain.（= We would have had a pleasant journey if it hadn’t rained.）
* without/with (在不具备/具备…的条件下), 如：
Without his help, I could not have done it well. (=If he hadn’t helped me, I could not have done it well.)
With favorable winds, we might have got there in tow days. (= If there should be favorable winds, we might have got there in tow days.)
* under （在…条件下）
We could have done better under more favorable conditions. （= We could have done better if we were to be under more favorable conditions.）
（2）分词短语充当条件（分词短语本身就具有充当条件状语的功能），如：
Given a certain oppertunity, he could have shown more talent. (= If he hade been given a certain oppertunity, he could have shown more talent.)
（3）表示不具备条件的连词连词：but,but that,or或otherwise不定式短语
They would have resisted but that they lacked courage. （= They would have resisted if they hadn’t lacked courage. 要不是缺乏勇气她们会抵抗的. ）
诸如此类，不一而足。
2. 狭义含蓄指的是不用任何语言方式显示条件，而是把条件隐藏在具体的原环境中，
（1）用上下文暗示条件，如：
I was so busy then, otherwise, I would have finished it. （If I hadn’t been busy then, I would have finished it.）
It rained yesterday, or I would have gone camping. (If It hadn’t rained yesterday, I would have gone camping.)
（2）用委婉语气暗示条件，如：
Would you mind opening the window? (=Would mind if I opend the window.)
Could you do me a favour to pass me the book? (= You would do me a favour if you should pass me the book. )
（3）用表示愿望的语气暗示条件，如：
Long live the Chairman Mao! (= If Chairman Mao should live long.)
（4）用其他语言环境暗示条件，如：
That would be fine. ( =省略了If you should do it.)
You might saty here forever. (=省略了 If you wanted to.)
I would not have done it. (=省略了 If I were you.)
二、含蓄条件句的虚拟时间
含蓄条件句是一种不出现条件从句的句子，也就是说它只是单独的一个主句形式，因此谓语动词就是主句所要求的形式.
1. 表示对过去的虚拟：情态动词 would/could/should/ought to have done
2. 表示对现在或将来的虚拟：情态动词 would/could/should/ought to do

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这不是虚拟语气。
表假设，但不是真的，用虚拟。
For example：If I were you.
这里就是虚拟，如果我是你，但我不可能是你，用虚拟。

昨天是个好天气，我本不必带伞的。但事实是我昨天带伞了，因此是过去的虚拟。这里可理解为省略了条件的虚拟句，可还原为：The weather turned out to be fine yesterday.（ If i had known it ）i needn't have taken the trouble to carry my unmbrella with me。其实虚拟语气的句子有时会省略主...

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昨天是个好天气，我本不必带伞的。但事实是我昨天带伞了，因此是过去的虚拟。这里可理解为省略了条件的虚拟句，可还原为：The weather turned out to be fine yesterday.（ If i had known it ）i needn't have taken the trouble to carry my unmbrella with me。其实虚拟语气的句子有时会省略主句或从句，一般省略部分的意思是可以体现出来的，有时为了为强调条件，会省略主句。
如：（if i were you), I would not smoke. 我要是是你的话，我是不会抽烟的
If only I had taken your suggestion,(I wouldn't have failed) 要是当时听从你的意见就好了，那样我就不会失败了，事实是： i didn't take your suggestion so i failed

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