2.If there were a heavy snow next Sunday, we would not go skating. 如果下周日下大雪,我们就不能去滑冰了。(事实:不知能否下雪)
3.If she were to be there next Monday, I would tell her about the matter. 如果她下周一来这儿的话,我就会告诉她这件事的始末。有时可以把含有助动词、情态动词、be或have的虚拟条件句中的连词if 省去,而将had , should, were 等词提到主语之前,即用倒装结构,这时候,如果出现not等否定词,否定词需放在主语后面。这种结构在口语中很少使用,但频频出现在各类考试中出现,例如:If it had not rained so hard yesterday we could have played tennis.→Had it not rained so hard yesterday, we could have played tennis.
个别句子中也可以通过介词without和介词短语but for表达,副词otherwise等表达出来。值得注意的是,包含but for的句子,谓语动词必定要用虚拟形式,但包含without等短语的句子,谓语动词未必一定要用虚拟语气。 虚拟语气(Subjective Mood)的其他用法其他形式的虚拟语气
it is +necessary等形容词后,that主语从句中虚拟形式使用,这类形容词包括necessary, important, essential, imperative, urgent, preferable, vital, advisable等例如It is necessary that you listen to the teacher carefully.或者It is essential that you be able to pronounce every single word correctly.
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