From experience, I know that:
which, who, where, why, whom, there, that
are relative pronouns but I wonder about the expressions:
'by which', 'to which', 'at which', 'to whom
Are these also Relative pronouns in an Adjective clause?
Example: this is the lab to which I go everyday.
Here I believe 'which' is the only relative pronoun: not the combined words 'to which'. I think that 'to' is just a preposition modifying the relative pronoun meaning.
Am I correct or wrong?