Question

i don't understand how you could miss the money? 这句话我换成 could have 的话，意思有什么不同？

i don't understand how you could miss the money? 这句话我换成 could have 的话，意思有什么不同？ 这里定义这两个都是在说过去，因为我知道 could 可以表示现在的情况。

Answer 1

如果你说换成 could have 的话，这就是非常具体的指这件事情了，就像是在说，我不知道你在当时那种情况下，你禅凳怎么可能丢钱, 然侍拦后我是需要你说原因的。 could 就是说，我不理解一个人在任何情况下怎么可能丢钱，然后我不是真的问你原因，我是表示不可思议？愤怒？的情绪。。。中老袭胡文真的绕口。
"i don't understand how you could miss the money?" implies that i don't understand how you or any others could ever miss the money in any circumstance.

"i don't understand how you could've missed the money?" could be rephrased as: i understand how you might have missed the money in other circumstances, but how did you miss it in that particular circumstance?
and to me, first sentence isn't a genuine question, the speaker don't intend to ask for the answer, just to express a sense of disbelief. for the second one, the speaker really wants to know how it was possible for you to miss the money.

Answer 2

i don't understand how you could miss the money? 这句话我换成 could have 的话，意思有什么不数带或同？ 这里定义这两个都是在说过去，因为行唯我知道薯伍 could 可以表示现在的情况。