You told me that you're not a native English speaker.

你跟我说过你的母语不是英语。

第二外语，英语 - SpeakingMax英语口语达人

So, if you're a native monolingual speaker of English you hear speech and each sound you hear is categorized as falling into one of those forty morphemes--sorry, phonemes.

如果你是英语母语的单语说话者,你听到一段演讲,你所听到的每个声音,都被归类为这四十个音位中的一个

耶鲁公开课 - 心理学导论课程节选

maybe you're practicing English with a native speaker and you didn't quite catch what the other person said.

也许你正和一位母语为英语的朋友练习英语口语，但你没能很好地理解那个人在说什么。

Would you 课堂 - SpeakingMax英语口语达人