表达不确定的反意疑问句：声调先下降，在句尾上扬。
Tag question that expresses uncertainty: Voice drops first and then rises at the end.
特殊疑问句：声调在句尾处下降。
Information Questions: the voice generally drops at the end.
有时候，可以在句尾用升调把一个陈述句变成一个疑问句。
It's possible to make a question out of a statement by raising your voice on the end of the sentence.
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