2012考研必备：考研英语语法精要(19)

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3.含蓄虚拟条件句的谓语动词形式
    含蓄虚拟语气是指假设条件不通过if从句表达，而是暗含在其他结构中。考生应熟悉：
    (1)连词but, but that, or, or else；副词otherwise, unfortunately等表示转折假设。如：
    A safety analysis would have identified the target as a potential danger. Unfortunately, it was never done.
    Victor obviously doesn’t know what’s happened; otherwise he wouldn’t have made such a stupid remark.
    (2)介词短语暗含假设条件，常用的有：without, but for, under more favorable conditions等。如：
    But for the English examination I would have gone to the concert last Sunday.
    (3)intended/meant/hoped/wished/planned或was/were +不定式完成式或had intended/meant/planned/hoped/wished
    +不定式一般式暗示虚拟语气。如：
    I intended to have called on you, but I was busy at that time.
    (4)情态动词完成式暗示虚拟语气。如：
    I should have called to make an airline reservation, but I didn’t.