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在英语虚拟语气中,当表达与将来事实相反或将来不太可能发生的情况时,从句(条件句)的谓语动词可以通过以下三种形式体现假设性: 过去式(如:took, went) should + 动词原形(如:should take, should go) were to + 动词原形(如:were to take, were to go)
在表示与将来事实相反或在将来不大可能发生的情况时,虚拟语气的从句谓语动词主要有三种形式:一般过去式、should + 动词原形、were to + 动词原形。它们的区别主要体现在 正式程度、语气的强烈程度 以及 具体使用的语境。
I will feel very guilty if anything should [=were to] go wrong. … ” --- ( Merriam-Webster's Advanced Learner's English Dictionary: should )