一、与现在事实相反
若与现在事实相反,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 you took a taxi,youd 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,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 Id left sooner,Id 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,Im sure hed 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)
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