分析 句意:如果她早知道蘑菇有毒,她就不会采来当晚餐了.
解答 答案:would not/wouldn't have picked.根据题干中if从句中谓语动词的形式had done可知是对过去情况的假设,所以主句中的谓语动词相对的要用would have done来表示对过去情况的假设,从而使得主从句保持一致.结合句意,因"蘑菇有毒"所以"不会采",符合逻辑,所以要用否定式would not/wouldn't have done.
点评 此题考查if条件从句的虚拟情况.if条件从句的虚拟情况有三种形式:①如对现在情况假设:if条件从句的谓语动词形式为过去式(be为were),主句的谓语动词形式为would/could/might/should do ②如对过去情况假设:if条件从句的谓语动词形式为 had done,主句的谓语动词形式为 would/could/might/should have done ③如对将来情况假设:if条件从句的谓语动词形式为were/did;should do;were to do,主句的谓语动词形式为would/could/might/should do.解此类题的关键是要判断对什么时间的假设,再而确定正确的谓语动词形式.
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