Sep 4, 2009 Rule: Use commas before and after nonessential words, phrases, and clauses, that is, elements embedded in the sentence that interrupt it...
owl.english.purdue.edu/owl/resource/607/05
Rule 1: Do not use commas to set off an essential clause. Start such clauses with that. Rule 2: Use commas to set off a nonessential clause. Start such clauses with which.
www.newsroom101.com/NR_exercises/grammar/comma/essentia... www.newsroom101.com/NR_exercises/grammar/comma/essential_nonessential.html
Grammar Bytes! Grammar Instruction with Attitude. Includes detailed terms, interactive exercises, handouts, and more! If, however, we revise dog and choose more specific words instead, the relative clause becomes nonessential and does require commas to separate it from the rest of the sentence. Read this revision...
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If, however, we eliminate vegetables and choose a more specific noun instead, the adjective clause becomes nonessential and does require commas to separate it from the rest of the sentence. Read this revision...
www.chompchomp.com/terms/adjectiveclause.htm www.chompchomp.com/terms/adjectiveclause.htm
Comma Usage for nonessential clauses is easy to understand. Everyone can understand English grammar!
www.english-the-easy-way.com/Punctuation_English/Noness... www.english-the-easy-way.com/Punctuation_English/Nonessential_Clauses.htm
Sep 12, 2009 A clause can be essential or nonessential based on the writer's intention A nonessential clause interrupts the flow of a sentence with...
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Clauses are "essential" if they specifically modify a noun, making it specific. A clause is "nonessential" if it simply adds information without making a...
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essential, nonessential clause (same as restrictive, nonrestrictive) An essential clause can't be omitted without changing the meaning of a sentence, so it shouldn't be set off with commas. Any clause introduced with "that" is an essential clause and uses no comma.
www.umt.edu/urelations/style/e.htm
An online dictionary of grammatical terms. A free online dictionary pertaining to the terms and rules of English grammer. (e.g., The hostess, who was a tall blonde woman with green eyes, led us to the drawing room.) A nonrestrictive clause is also termed a nonessential clause) See also APPOSITIVE  RESTRICTIVE CLAUSE...
www.writingenglish.com/glossary.htm
Essential and nonessential dependent clauses The nonessential clause gets the comma. Here is a list of introductory words and phrases that may introduce both essential and nonessential clauses, and therefore require the utmost caution:
nawctsd.navair.navy.mil/Resources/Library/Acqguide/spec... nawctsd.navair.navy.mil/Resources/Library/Acqguide/specwrit.htm