我听你在说说用英语是 "I hear what you're saying"。它的来源可能是因为"听"这个词在英语中的意思是 "to psten"，所以"听你在说"就可以直接翻译成"I psten to you speaking"。不过，"I hear what you're saying"这个短语更为常见，它表示你在倾听对方的话，并理解对方的意思。例句如下：
I hear what you're saying, but I still don't agree with your opinion. (我听你在说，但我还是不同意你的看法。)
I hear what you're saying, and I understand where you're coming from. (我听你在说，我理解你的观点。)
Thank you for explaining your thoughts to me. I hear what you're saying. (谢谢你向我解释你的想法。我听你在说。)