i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么

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i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么

i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么
i did not understood the problem until he had explained it.
这句可以改成i had not understood the problem until he explained it.这样 为什么

i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么
答:不可以!
until是引导时间状语从句的一个连词,表示：一直到.时候为止（主句中表示延续的动作或存在的状态延续到这个时间为止）.本句中是我不明白这个问题的这种状态一直延续到他解释完这个题目为止（然后就明白了）
until从句多用一般过去时,表示到某个动作发生的那一刻为止,也可用过去完成时,表示到那个动作结束是为止.这里不用until he explained it 而用until he had explained it. 是因为不是一开口解释就明白了的,而是解释完成后,我就由不明白转变为明白的状态了.
你改写的句子,主句是过去完成时,表示这个动作或情况发生在从句之前.一般用介词或连词before:
A had happened before B happened. A事件在B事件发生之前发生.

i did not understood the problem until he explained it.
这样写是对的

不可以 注意动作先后 先解释 后明白 动作之前的 可以用过去完成时
不过连词until本身已表明 时间先后 所以 主句和从句 都用一般过去时 即可
i did not understand the problem until he explained it.直到他解释 我才理解 这道题

不能，过去完成时表示过去的过去，是先有他解释，后才有我明白！

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