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5．Why do you have to...?
你为什么要……?

Why do you have to tell her the truth?
你为什么要告诉她真相?

Why do we have to help you.
还有为什么让我们帮助你。

Those are common manifestations, which is why you do have to remain vigilant.
这些现象表明，你必须保持警醒。

However, you need to do some calculations and you may want to understand whyyou have to do so.
但是，您需要做一些计算，您可能想明白你为什么要这样做。