i did not understand the problem until he had explained it.我

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/17 12:04:14

i did not understand the problem until he had explained it.我觉得这句话的时态用错了吧我不明白问题应该发生在前,用过去完成时吧而他帮我解答发生在后,应该用一般过去时吧不就明白了吗?
这是新2书上的一句话,各位看下是否时态用错了,如果没哟 ,why?

时间顺序是这样的：
你不懂（最早的持续状态）-> 他解释（过去的事情）->你不懂（在解释后,这个状态才消失） -> 你明白了（也是过去的事情,但是是发生在他解释完之后）
这么看的话"I did not understand the problem"这个持续状态是一直持续到他讲明白以后才会消失的.因此在时间上这个状态算在“he had explained it"之后.所以"I did not understand the problem"用的是过去时,而不是过去完成时.
如果上面的解释你不懂,那么有个更简单的方法：
把该句的同义句写出来：把这里用的Until（直到...才）,换成after（...之后）
I did not understand the problem until he had explained it
换成：I understood the problem after he had explained it.
以上两句是同义句
翻译后应该是：直到他解释完后我才明白这个问题.
这里就很明了了,前半部分发生在后半部分之后,所以前面过去式,后面过去完成时.

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