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1、在学习虚拟语气的时候,要对过去、 现在、 将来的虚拟的做出正确的判断。
2、一定要记住,虚拟语气的条件从句的谓语用过去式,动词be要用were。
典型例题:I ________ him the answer ________ possible, but I was so busy then.
A. could tell, if it had been
B. must have told, were it
C. should have told, had it been
D. should have told, should it be
解析:先分开看此题,由于设空处在主句,所以先看主句,因为由主句看不出题目所表达的具体时间,所以再看从句,此从句是由but引导的转折句,所表达的时态是一般过去时,意为“我那时很忙”,所以,主句发生的事情是与过去事情相反的事情,因之,主句用could、should、would 动词原形,从句用过去完成时。
答案:C