Hacker News Reader

Thanks. Now I know that I'm not that stupid and this actually makes no sense

It actually does make sense. Not saying you're stupid, but in standard English, if you say it quickly, the two sentences are nearly identical.

They're pretty different in British English, I struggled to figure it out until I started thinking about how it would sound with an American accent.

But in "you sing", "s" is pronounced as "s", not as "z" from "using", right?

I pronounce using with an S unless I'm saying it very slowly