神马作文网past perfect 用法
来源：学生作业帮 编辑：神马作文网作业帮 分类：英语作业 时间：2024/11/20 10:57:05
past perfect 用法
过去完成时表示在过去某个时间或过去的某个动作之前发生的动作.即：过去的过去.
构成：had + 过去分词
如: We had learned 2000 words by the end of last term. 这句的意思是：到上学期末（为止）我们已经学了2000个单词了. “上学期末”已经是过去 by 是“到……为止” by the end of last term “到上学期末为止”是指比上学期末更早的时间,即为“过去的过去”
The trained had left when we got to the station. 当我们到车站时,火车已经开走了.
我们到车站已经是过去的动作,火车开走在到车站这个动作发生之前,所以用过去完成时
by+一个过去时间一定跟过去完成时连用
构成：had + 过去分词
如: We had learned 2000 words by the end of last term. 这句的意思是：到上学期末（为止）我们已经学了2000个单词了. “上学期末”已经是过去 by 是“到……为止” by the end of last term “到上学期末为止”是指比上学期末更早的时间,即为“过去的过去”
The trained had left when we got to the station. 当我们到车站时,火车已经开走了.
我们到车站已经是过去的动作,火车开走在到车站这个动作发生之前,所以用过去完成时
by+一个过去时间一定跟过去完成时连用
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