Hi, maybe Reminders that are Either/or… defines or gives essential (rather than additional) information Pocket Fowler's Modern English Usage That may be an alternative to which (and occasionally who). Although they are often interchangeable, there are some uses that are peculiar to each: (a) When that is used it normally introduces a so-called ‘restrictive’ clause, which defines or gives essential (rather than additional) information about the noun or noun phrase that comes before (c) Which, not that, has to be used in so-called non-restrictive clauses which give additional rather than essential information: A new edition of the book, which has taken ten years to write, will be published this week.
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