Re: In using relative clause,sometimes I see that the relative pronouns "Which" and
Along with my "Save the Subjunctive Support Group" I may have to start a "Restrictive That, Unrestrictive Which" group too. I really am one of the people who finds the distiction useful. But then, I also keep comrise and compose, and infer and imply as separate words too, despite the prevailing trends.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.