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、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)；
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。
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：
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绛旓細鈶 澶у鏁扮殑铏氭嫙鏉′欢鍙ュ睘浜庝笂闈笁绉嶆儏鍐电殑涓绉嶏紝浣嗗苟涓嶆帓闄ゅ瓨鍦ㄦ潯浠跺拰鍚庢灉涓锛屼竴涓鍜岀幇鍦ㄦ儏鍐电浉鍙嶏紝鍙︿竴涓拰杩囧幓鎯呭喌鐩稿弽锛屼緥濡傦細If you had followed what the doctor said, you would not have been so painful now.杩欎釜鍙ュ瓙鍦ㄩ珮涓嚭鐜伴鐜囬楂樸傗懀 浣嗘槸锛屽鏋滃悗鏋滅敤浜铏氭嫙璇皵锛鑰屾潯浠跺嵈鐢ㄩ檲杩拌姘...
