A relative adverb

AnonymousHi, teachers,
I remember the moment when [or that] we met first.
I don’t know the city where [or that] he came from.
This is the reason why [or that] I missed the class.

I remember the moment [when] we first met.
I don't know the city [that/which] he came from. (I think the intended meaning is: I don't know what/which city he came from.)
This is the reason [why] I missed the class.

CB

In my opinion you missed the point. I want to know about the usage of conjunction, that. Can “that” replace relative adverbs? If so, is that clause “appositive”?

I remember the moment that we first met.
the moment (an antecedent) = that clause(?)

AnonymousI remember the moment that we first met.

In that case, "that" is not necessary in my opinion. Consider: I can count the times [that] you came to work late.
" That" has many properties. Most commonly used is a relative pronoun as well as an adverb. But with the context in your example, "that" behaves more like an

AnonymousI remember the moment when [or that] we met first. I don’t know the city where [or that] he came from. This is the reason why [or that] I missed the class. As the above sentences, can a conjunction, that substitute for a relative adverb, when, where, why, and how?If so, is that clause appositive?

Yes,

Thank you so much BillJ.

What about "where" in the sentence below? Can this relative adverb be replaced with appositive-that? (Well, you might still call it a relative adverb as well though) In other words, in some cases like this, could relative pronoun and appositive-that be used interchangeably?

"You ever have that feeling where/that you're not sure if you're awake or still dreaming?"

Anonymous"You ever have that feeling where/that you're not sure if you're awake or still dreaming?"

Informally, many native speakers use, "Have you ever had the feeling where ... (description of a situation)?"