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SAT语法题一道~(Were they to be told) the purpose of the study ,th

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SAT语法题一道~
(Were they to be told) the purpose of the study ,the participants might find it difficult to answer the questions spontaneously.为什么were they to be told没错?这个不是虚拟语气的倒桩吗?这句话怎么回事虚拟语气?might不用于虚拟语气的吧?
这个是虚拟语气,表达与将来事实相反,本来的顺序是if they were to be...可以去掉if倒装为were they to be...,和if they should...倒装为should they...是一样的.而主句的谓语动词可以是would...,也可以是might.
再问: 那还可以把might改成could吗?
再答: 可以。虽然表示将来的虚拟语气多用should, would,但是少数情态动词(如might, could)也有使用的时候,只要符合情境就可以。