she has been in hospital since she was shot on the head 为什么要

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 16:53:37

she has been in hospital since she was shot on the head 为什么要用since不能用after
除了前面是现在完成时这个理由

原因：since是“自从...以来”,与现在的时间有关联；而after是“在.时间之后”,不一定和现在的时间有关联.
此外,after 和since 的用法如下：
1.一般说来,如果在过去某一时间内先后发生了两个动作,那么先发生的动作用过去完成时（从句）,后发生的动作用一般过去时（主句）.
如果使用连词after 来连接这两个动作,由于after本身已说明了两个动作的先后关系,所以两者均可用一般过去时.
2.since “自从” 在这里since是连词,后面接的是时间状语从句 she was shot on the head.
“since+过去的时间点”表示一段时间,即从这一时间点一直到现在这一段时间.
含有“since+过去的时间点”的句子谓语动词要用现在完成时.
祝开心~
再问：那after 后面是接一种状态还是动作短暂动作呢
再答： after 后面可以接表示时间的短语，或者是时间状语从句。如果接时间状语从句，那么从句用过去完成时（表示这个动作已经完成），主语用一般过去时。由于after本身已说明了两个动作的先后关系，所以也可均用一般过去时。
再问：那这句话在他头部中枪后他一直呆在医院不是挺通的
再答：用这after的时候，通常前后是有内在顺序的，如果硬使用after，最好就是she was in hospital （after ) she was shot on the head

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