[英文]问题假设语气求解

假设语气句型:if+主词+had + pp + 主词+助动词+have+pp
ex: If it had rained a lot l ..

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Ans：

假设法的用法：

1、假设的部分我们可以称之为条件子句
与事实相反的句子是由时态往前推一级,
如:条件子句而言,反现在用过去式,反过去用过去完成式,
  与现在事实相反里的Be动词只用were

因此，若相反于过去事实，则应用过去完成式：
If＋S＋had＋V-en, S＋should (would, could, might)＋have V-en....
＝Had＋S＋V-en S＋should (would, could, might)＋have V-en....

例：如果当时我知道你要来，我会做个蛋糕给你。
　　If I had known you were coming, I should have baked a cake.
　　＝Had I known you were coming, I should have baked a cake.

2、遇到主要子句和条件子句所反的事实是属于不同时态时，必须分别依所反的时态来写。

因此，如果条件句相反于过去，而结果子句（主要子句）相反于现在，则改用：
If＋S＋had＋V-en, S＋should (would, could, might)＋V…now (today, this year, this time).
＝Had＋S＋V-en, S＋should (would, could, might)＋V…now (today, this year, this time).

例：假使你去年更用功研读英文的话，你现在或许就熟练它了。
　　If you had studied English more industriously last year, you might be proficient in it now.
　　＝Had you studied English more industriously last year, you might be proficient it now.

由上可知您问的
○ If it had rained a lot last month, we would have enough water now.
× If it had rained a lot last month, we would have had enough water now.

以上参自：
http://www.wretch.cc/blog/pinna33/13808669
http://www.nani.com.tw/nani/slearn/sleng/sleng_d.jsp

(ps:以上解释若有错误，烦请高手不吝指正，谢谢。)

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有个地方还不是很懂也
句型主要子句是 主词+助动词+have+pp =>这个的(have+PP)   而下面句子不是要写成have had enough water now吗
而只写 would have (PP)? enough water now
这样少了一个pp也
If it had rained a lot last month, we would have enough water now

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下面是引用 imyumi 于 2009-09-24 21:36 发表的 :
有个地方还不是很懂也
句型主要子句是 主词+助动词+have+pp =>这个的(have+PP)   而下面句子不是要写成have had enough water now吗
而只写 would have (PP)? enough water now
这样少了一个pp也
If it had rained a lot last month, we would have enough water now

您问的就是我上面解说的特例
2、遇到主要子句和条件子句所反的事实是属于不同时态时，必须分别依所反的时态来写。

主要子句相反于现在的，用过去式

所以用过去式we would have enough water now.
                        过去式

您问的If it had rained a lot last month, we would have had enough water now.
要改成If it had rained a lot last month, we would have had enough water then(当时，那时). 
                                                                   相反于过去的才用过去完成式
或改成If it had rained a lot last month, we would have had enough water .

才对。


(ps:以上解释若有错误，烦请高手不吝指正，谢谢。)

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我懂了
原来我忽略"now"大爷了
谢谢大大^^

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