作业帮新概念3第一课有个句子不太明白
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/12 01:50:21
新概念3第一课有个句子不太明白
When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,
这里用了过去完成时 但是因为这里有when 把过完 改成一般过去式也是可以的把
When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,
这里用了过去完成时 但是因为这里有when 把过完 改成一般过去式也是可以的把
不可以.
When引导的是一整个从句：reports came into London Zoo that a wild puma had been spotted forty-five miles south of London
that引导的是When从句中的一个从句： a wild puma had been spotted forty-five miles south of London,用来修饰reports.显然,puma被spot的动作发生在reports came之前,所以要用一个比reports came更早的时态,也就是过去完成时.
再问： It's OK,Susan.we had this part of the conversation before Michelle and her friends arri 这个一个前一个后 为什么就用一般过去式你怎么解释呢
再答： 主句是we had this part of the conversation。如果不考虑虚拟语气，主句一般只用四种时态：一般过去，一般现在，现在完成，一般将来。主从有别，主句不用跟随从句变化，但从句时态要跟随主句变化。
When引导的是一整个从句：reports came into London Zoo that a wild puma had been spotted forty-five miles south of London
that引导的是When从句中的一个从句： a wild puma had been spotted forty-five miles south of London,用来修饰reports.显然,puma被spot的动作发生在reports came之前,所以要用一个比reports came更早的时态,也就是过去完成时.
再问： It's OK,Susan.we had this part of the conversation before Michelle and her friends arri 这个一个前一个后 为什么就用一般过去式你怎么解释呢
再答： 主句是we had this part of the conversation。如果不考虑虚拟语气，主句一般只用四种时态：一般过去，一般现在，现在完成，一般将来。主从有别，主句不用跟随从句变化，但从句时态要跟随主句变化。