non-restrictive relative clause
Definition - A clause that gives additional, non-identifying information about the sentence's subject.

As opposed to a restrictive relative clause, which gives information that is necessary to precisely identify the sentence's subject.

Example -
My car, which is in the tree, has suspension problems.
(We know that the car is my car, so the non-restrictive relative clause which is in the tree is additional, non-identifying information.)

Usage:

1. Always set off non-restrictive relative clauses with commas.

Barb's husband, who is a real piece of work, is never home.



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