Who vs. That vs. Which
(adapted from https://www.grammarbook.com/grammar/whoVwhVt.asp)
Rule 1: Who refers to people. That and which refer to groups or things.
More below on this…
Rule 2: That introduces essential clauses while which introduces nonessential clauses.
A clause is “essential” if taking it away seems to significantly change the meaning of the sentence—usually, taking out an essential clause leaves you wondering what the point was.
I want to find a job that allows me to exhibit my full range of weird imagination.
(Taking out the clause following “that” leaves: I want to find a job. Not the same sentence at all!)
On the other hand, nonessential clauses serve, basically, as adjectives:
I have a job already, which allows me to pay rent, but I don’t feel very fulfilled by it. And my current job does involve a bit more killing than I would prefer.
NOTE: Essential clauses…
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