Here's my take. *The students, who were lazy, failed the exam. [all the students in question] *The students who were lazay failed the exam.
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Philip*The students, who were lazy, failed the exam. [all the students in question]*The students who were lazNothing much to explainay failed the exam. [Those who weren't lazy passed the exam.]The question involves restrictive vs non-restrictive, I believe. Others here will be able to explain what I'm trying to say (if they agree with me, that is).