I was driving a car that I didn't know how fast it could go.
I don't see whether I should call that a conjunction or relative. I would be tempted to call that a conjunction because the clause, I didn't know how fast it could go, is a complete sentence.
anonymous I don't see whether I should call "that" a conjunction or relative (pronoun) . It's pointless to call it anything. It's in an ungrammatical sentence.
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anonymousI don't see whether I should call "that" a conjunction or relative (pronoun).
It's pointless to call it anything. It's in an ungrammatical sentence.
CJ
I was driving a car that I didn't know [how fast ____ it could go].
Your sentence is ungrammatical for two reasons:
[1] The embedded clause in brackets already has a subject, "car", represented by th