给你一个句子，如何辨别虚拟语气中的三种时态，请举例子

Question

如题所述

Answer 1

一、与现在事实相反
若与现在事实相反，虚拟语气的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 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：追答

If he went，would you go too? 如果他去，你也去吗?(大概他不会去)
If I asked him，I'm sure he'd help us. 如果我向他提出要求，肯定他会帮助我们。(不过我不打算这样做)
注意与说明：对于与将来事实相反的情形，请注意以下几点：
一是这里说的与将来事实相反，实为对将来情况的推测；
二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”(表示可能性极小，常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设)；

Answer 2

1、对现在的虚拟结构：if+主语+动词动词过去时，主语+should/would+动词原形 ，should不可以省略。

【例句】If I had had enough money, I would have joined the swimming club.

【翻译】如果我有足够的钱，我就能去参加游泳俱乐部了。

2 、对过去的虚拟结构：if+主语+had+过去分词，主语+should/would+have+动词过去时。

【例句】If she had told him about the danger, he would not have got hurt.

【翻译】如果她能早点告诉他危险，他就不会受伤了。

3 、对将来的虚拟结构：if+主语+should+动词原形（were to+动词原形），主语+would/should+动词原形，这个should 可以省略。

【例句】If he had followed my advice, he would not suffer so much now. 

【翻译】如果他当初听我的意见，现在就不会受那么多的罪了。

虚拟条件句的从句中如果有助动词were; had或should可以去掉if以后用倒装句语序。

【例句 】： 

1、Had I not helped him, he would have failed in business. 

如果我没有帮助他，他就无法完成他的工作。

2、Should I be free, I would come . 

如果我有空的话，我就会来。

3、Were she my daughter, I could suggest a different plan .

如果她是我的女儿,我会提出不同的计划。

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Answer 3

一、与现在事实相反
若与现在事实相反，虚拟语气的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 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 he went，would you go too? 如果他去，你也去吗?(大概他不会去)
If I asked him，I'm sure he'd help us. 如果我向他提出要求，肯定他会帮助我们。(不过我不打算这样做)
注意与说明：对于与将来事实相反的情形，请注意以下几点：
一是这里说的与将来事实相反，实为对将来情况的推测；
二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”(表示可能性极小，常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设)；

Answer 4

一般现在时态，if从句用were或动词过去式， 主句用would +动词原形。如：
If I were you, I wouldn't do that.
If后面用were, 如果是其它动词也用过去式，而主句 是would not+动词原形。

一般将来时态，和一般现在时态的构成一样：，if从句用were或动词过去式， 主句用would +动词原形。要从意思上判断。
If he came tomorrow, I would tell him all about it.
如果他明天来了，我就把这一切都告诉他。构成方法和上面句子一样，但意思很明显。

一般过去时，if从句用过去完成时，主句用would have+过去分词，如：
If I had seen the movie, I would have finished my composition about it.
如果我看了这部电影，我就完成了关于它的作文了。因为if后面是had seen, 主句是would have finished, 所以说的是过去的事。

Answer 5

虚拟语气的三个时态：（注意：在虚拟语气中通常不用was，若需要用was时，通常用were代替。）
1.当于现在事实相反时，主句用might/would/could/should+do；从句用did。
例句：If I had enogh free time,I might/would /should do much exercise.如果我有更多的空闲时间，我会做更多的练习。（我没有更多的空闲时间）
2.当于将来事实相反时，主句用might/would/should/could+do；从句用①should+do；②did；③were。
例句：If I should work hard,I would get success in my life.如果我努力工作，我将会在我的生活中取得成功。（我没有努力）
3.当于过去事实相反时，主句用might/would/should/could+had done；从句用had done.
例句：If I had heard my teacher's advice,I would/should/could/might have been admitted by a good university.如果我听了我老师的建议，我可能会被好的大学录取。（我没有听）