You are a party pooper.

你真扫兴.

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One answer to these questions is that nobody likes a party pooper.

这些问题的答案是没有人喜欢给别人泼冷水的人.

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You can be a real party pooper sometimes, do you know that?

你知道吗,有时候你真是一个很扫兴的人?

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I hate to be a party pooper, but I am really tired.

我不想扫大家的兴，不过我真的累了。

柯林斯例句