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The phrase "可不是" (kě bù shì) is a colloquial expression in Chinese that is often used to affirm or emphasize a statement made by someone else. It can be translated as "that's right," "indeed," or "you bet." This expression is typically used in informal conversations to agree with or reinforce what the other person has said.
In the examples provided:
甲：什么？我们家出事了？
(A: What? Something happened at our house?)
乙：可不是，警察都已经来了。
(B: Indeed, the police have already arrived.)
Here, B uses "可不是" to confirm A's concern about the situation at their house.
甲：小孩子长得真快啊！
(A: Kids grow up so fast!)
乙：可不是，已经要上小学了。
(B: Indeed, they are already going to elementary school.)
In this case, B uses "可不是" to emphasize the truth of A's observation about how quickly children grow.
Overall, "可不是" serves as a conversational tool to express agreement and can be used in various contexts to affirm statements or observations made by others.