所述与过去的事实相反时,if从句的谓语形式用过去完成时:had done.即上文的"had spent".然后主句的谓语形式用would/could/should/might+have done.即上文的"would have been"
第二句虽然也是与过去相反的.但主句中有时间状语"today"
today是表现在的时间状语.所以用would be
卟可以交换.
1)the boy passed the final exams,But if he had spent more ti
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