为什么用现在完成时呢原文是这样的：I left a suitcase on the train to London the other day. Can you describe it, sir? It's a small blue case and it's got a zip. There's a label on the handle with my name and address on it. Is this case

为什么用现在完成时呢原文是这样的：I left a suitcase on the train to London the other day. Can you describe it, sir? It's a small blue case and it's got a zip. There's a label on the handle with my name and address on it. Is this case
为什么用现在完成时呢
原文是这样的：
I left a suitcase on the train to London the other day.
Can you describe it, sir?
It's a small blue case and it's got a zip.
There's a label on the handle with my name and address on it.
Is this case yours?
No, that's not mine.
What about this one?
This one's got a label.
Let me see it.
What's your name and address?
David Hall, 83, Bridge Street.
That's right.
D.N.Hall, 83, Bridge Street.
Three pounds fifty pence, please.
Here you are.
Thank you.
Hey!
What's the matter?
This case doesn't belong to me!
You've given me the wrong case! 问题是最后一句,为什么你给了我一个错的箱子,要用现在完成时呢,you gave me a wrong case?可以吗

为什么用现在完成时呢原文是这样的：I left a suitcase on the train to London the other day. Can you describe it, sir? It's a small blue case and it's got a zip. There's a label on the handle with my name and address on it. Is this case
现在完成时=== 由过去持续到现在...[ + ADV...already,once,yet,]
you gave me a wrong case?...过去式

强调已经完成的动作对象在的影响，指你给错了我箱子以至于给我现在带来了麻烦。