I'd rather not if you don't mind.

如果你不介意，我倒不希望这样。

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今天的几个句子都是拒绝他人请求的：1. I'm afraid I can't.  2. I'd like to, but I don't have the time.  3. I'm sorry, but I'm using it right now.  4. Certainly not!   5. I regret that I can't help you. (较正式用语）