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1. I am returning something that I bought yesterday. 注意退还商品的说法：
I would like to return an item.
I need to return something.
2. Was there somethinig wrong with it? 询问出现什么问题：
Is there a problem?
What is wrong with it?
3. It's defective. 产品有问题：
It's broken.
It isn't working properly.
4. What isn't working on it? 询问是什么问题：
What exactly is wrong with it?
What is the problem with it?
