It's not aways necessarily you - some people just don't hear properly. I know a lot of people who always say ''who?'' after you've said a name of someone. For example, ''I saw John yesterday in the supermarket'' and the other person hears all the other words in the sentence but the name and so goes, ''you saw who?'' never, ''you saw John when?'' or, ''you saw John where?'' It's always the name they don't hear, which I find frustrating.
But anyway, I need to improve my speech in a different to what you're saying. I find I get tongue-tied a lot, and I know a lot of people do but mine is frequent. Like I have to be careful when I say, ''I'm worried teenagers might throw snowballs at me'' because if I say it too fast I always end up saying, ''I'm worried teenagers might snow throwballs at me'', and other people grin when I do that and I get embarrassed.
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Female