Here’s another simple presupposition (where what is being presupposed is essentially the existence of the thing.)
Relative Clauses These are complex noun phrases where the noun is followed by a phrase beginning with who, which, or that.
I have noticed that people who practice their skills become most proficient.
It’s the kids who text constantly who worry me the most.
When you find friends who stand by you when the going is hard, cherish them.
She rode the horse which sold for the highest price that year.
Tuesday afternoons the guy that always wears cowboys boots comes in.