Re: Object or objective complement?
I've told my own children to use the line from Peggy Sue Got Married, if they want, on grammar tests. She turns in a blank algebra test and says (she's gone back in time so she knows this) more or less "None of this will ever be relevant to me in my life again."
I write for a living. I could not make my mortgage if I didn't know how to craft good sentences. I find my ability to label a verb as ditransitive or identify complements utterly irrelevant to my working life.
If it's fun for people, like a puzzle, great. But for anyone to think they can't learn to speak and write excellent English without knowing the labels for things is a fallacy.
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.