How do you say something like that?
"There's a thing for which I don't know what it is" "There's a thing where I don't know what it is" "There's a thing that I don't know what is"
or (the one which I hear people say a lot but sounds awkward:) "There's a thing that/which I don't know what it is"?
To be honest they all sound awkward to me to varying degrees
I'm not a grammar expert and English is not my first language but I think I used to say this before and I just ended up taking out the "what it is" and changed it for the thing I'm trying to remember:
Or
Or
Is that what you're refering to? Sorry if it's not. I don't think any of the first three examples are correct, or at least they sound really weird to me.
Please do correct me if there's an English mayor somewhere though!
Your solutions are perfect. Very well stated.