___it rain tomorrow ,we would have to put off the visit to London.A.Were B.Should C.Referred
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___it rain tomorrow ,we would have to put off the visit to London.A.Were B.Should C.Referred
___it rain tomorrow ,we would have to put off the visit to London.A.Were B.Should C.Referred
___it rain tomorrow ,we would have to put off the visit to London.A.Were B.Should C.Referred
B should
A
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 ...
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A
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)；
三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用陈述语气或祈使语气。如：
I should see him, I'll tell him. 万一我见到他，我就告诉他。
If it should rain tomorrow, don’t expect me. 万一明天下雨，就别等我了。
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A虚拟语气的倒装