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"Which" Vs. "That"
The choice between "that" and "which" is not one of formal versus informal style. "Which" is a non-defining relative
pronoun, and "that" is a defining relative pronoun. Use "that" to introduce a clause that identifies the person or thing (e.g.,
"Each made a list of books that had influenced him"); and use "which" to give a reason or add a new fact (e.g., "I
always buy his books, which have influenced me greatly.").
When used as a pronoun, "which" must have a clear antecedent. In "We could save a few hours, which would make things easier",
there is no antecedent. The sentence should read: "We could save a few hours; the extra time would make things easier".
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