Excuse me, we do so teach our JC kids how to avoid plagiarism. It's called "UYOWAFAS", a persistent feature in the GP compre paper. What does it stand for? "Use you own words as far as possible." Now you know what it's for.
As far as citing sources go, the kids practice that in Project Work. I wonder if this skill should be practiced in GP too? Would anyone kill me for suggesting that idea?