Mr Smith insisted that he(had done)the work by himself,but nobody believed him.
问题描述：
Mr Smith insisted that he(had done)the work by himself,but nobody believed him.
The girl insisted that she (didn't see) the cell phone on the way to school.
为什么第一句用过去完成式而第二句用过去式呢?
答
这正是过去完成时和过去时的区别.过去完成时要特别特别强调动作先后,即某个动作是在过去一个动作之前发生的.而过去时不用强调先后,视为在同一段时间发生的动作.第一句：斯密斯先生坚持说这个工作是他之前（特别强调...