In this dialogue:
A: 昨天他开车的时候，头撞了一下。
B: 怎么一回事?
Why the classifier 回 is used instead of 件?
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There are only a few phrases made up from 回事: 怎么(一)回事: what the matter with ..., why ..., what is the reason for ..., what happened 这回事: The matter you just mentioned (E.g 没这回事。 There was no such thing) 一回事: The same. (E.g. A和B是一回事。 A and B are the same (matter).) In the above situations, "件" cannot be used. |
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Normally, a "piece" of business, 事, is represented by 一件事. This could represent a contract, deal, or whatever. But in this case, the "business" is a car accident, i.e. an action. 件 doesn't work as a modifier in this instance. You need an "action" modifier like 回, which roughly means "to come and go." |
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